diff --git a/data/json/itemgroups/books.json b/data/json/itemgroups/books.json
index 0456a2f882436..c216656207ed3 100644
--- a/data/json/itemgroups/books.json
+++ b/data/json/itemgroups/books.json
@@ -482,7 +482,7 @@
     "//2": "The autobiography of a mountain man is included as, while an advanced survival book, it’s also a story novel in its current form. Should it be expanded with variants to include books that are not novels, then it should be removed.",
     "//3": "While a rather high-level fabrication book, this could conceivably be something that a craft shop/design and technology class would use in its current form: Plastics and Polymers: Projects for the Classroom. Should it be expanded with variants to include books that aren’t so school-based, it should be removed.",
     "//4": "While it has the potential to be a high-level tailoring book, its current form, Friendly, Humane Fashion, can be passed off as an educational library book. Should it be expanded with variants to include books that aren’t so school-based, it should be removed.",
-    "//5": "While a high-level speech book, Principles of Effective Communication, a public speaking book, isn’t unrealistic for a school library to possess,. Should it be expanded with variants to include books that aren’t so school-based, it should be removed.",
+    "//5": "While a high-level speech book, Principles of Effective Communication, a public speaking book, isn’t unrealistic for a school library to possess. Should it be expanded with variants to include books that aren’t so school-based, it should be removed.",
     "//6": "Bit of a stretch, but The Wonderful World of Arthropodology could feasibly exist as a library encyclopaedia.",
     "subtype": "distribution",
     "entries": [
diff --git a/data/json/items/toy.json b/data/json/items/toy.json
index 3fe885044f4f1..d2775ab7aea79 100644
--- a/data/json/items/toy.json
+++ b/data/json/items/toy.json
@@ -202,7 +202,7 @@
       {
         "id": "toy_plush_plesio",
         "name": { "str": "plesiosaurus plushie" },
-        "description": "A blueish, soft and friendly plesiosaurus plushie with big floppy flippers, a long neck and a and cute, gentle expression.",
+        "description": "A blueish, soft and friendly plesiosaurus plushie with big floppy flippers, a long neck and a cute, gentle expression.",
         "weight": 1
       },
       {
@@ -680,13 +680,13 @@
       {
         "id": "toy_plush_sheep",
         "name": { "str": "sheep plushie" },
-        "description": "This loving and fluffy sheep plushie features soft, woolly fur in white, with cute floppy ears and expressive eyes",
+        "description": "This loving and fluffy sheep plushie features soft, woolly fur in white, with cute floppy ears and expressive eyes.",
         "weight": 1
       },
       {
         "id": "toy_plush_bsheep",
         "name": { "str": "black sheep plushie" },
-        "description": "This loving and fluffy sheep plushie features soft, woolly fur in black, with cute floppy ears and somewhat careless, bored eyes",
+        "description": "This loving and fluffy sheep plushie features soft, woolly fur in black, with cute floppy ears and somewhat careless, bored eyes.",
         "weight": 1
       },
       {
diff --git a/data/json/npcs/godco/members/NPC_Sonia_Greene.json b/data/json/npcs/godco/members/NPC_Sonia_Greene.json
index bec03c962439c..3d639ea74100b 100644
--- a/data/json/npcs/godco/members/NPC_Sonia_Greene.json
+++ b/data/json/npcs/godco/members/NPC_Sonia_Greene.json
@@ -59,7 +59,7 @@
         "npc_has_var": "mission_completed_sonia_guitar_fixed",
         "value": "yes",
         "yes": "Just playing some good ol' tunes.  There's so much negativity around here, someone's gotta cheer people up, ya know?",
-        "no": "Nothin' much, just sitting around and biding my time,, getting any work I can.  I might play something to cheer everyone up, if my guitar wasn't busted."
+        "no": "Nothin' much, just sitting around and biding my time, getting any work I can.  I might play something to cheer everyone up, if my guitar wasn't busted."
       }
     ],
     "responses": [
diff --git a/data/json/npcs/godco/members/cook.json b/data/json/npcs/godco/members/cook.json
index 90413440c7c9d..dd58b56f61200 100644
--- a/data/json/npcs/godco/members/cook.json
+++ b/data/json/npcs/godco/members/cook.json
@@ -175,7 +175,7 @@
   {
     "id": "TALK_GODCO_chef_katherine",
     "type": "talk_topic",
-    "dynamic_line": "She's my wife, worked for the Church before <the_cataclysm>.  She used to organized charities for the needy, now we're the ones in need of charity.  She has a bit of a high horse these days, but a nice lady once you get to know her.  We've been married for 28 years, and I couldn't ask for a better wife.",
+    "dynamic_line": "She's my wife, worked for the Church before <the_cataclysm>.  She used to organize charities for the needy, now we're the ones in need of charity.  She has a bit of a high horse these days, but a nice lady once you get to know her.  We've been married for 28 years, and I couldn't ask for a better wife.",
     "responses": [
       { "text": "Who's Jeremiah?", "topic": "TALK_GODCO_chef_jeremiah" },
       {
diff --git a/data/json/npcs/militia/GM_Militia_Merchant.json b/data/json/npcs/militia/GM_Militia_Merchant.json
index 387858085ca69..0bd35f3905e78 100644
--- a/data/json/npcs/militia/GM_Militia_Merchant.json
+++ b/data/json/npcs/militia/GM_Militia_Merchant.json
@@ -189,7 +189,7 @@
       },
       { "text": "Do you have anything to trade?", "topic": "TALK_MILITIA_TRADE" },
       {
-        "text": "Time for me to leave",
+        "text": "Time for me to leave.",
         "topic": "TALK_MILITIA_BYE",
         "condition": { "u_has_var": "talked_to_MILITIAMAIN", "type": "dialogue", "context": "first_meeting", "value": "yes" }
       }
diff --git a/data/mods/Aftershock/items/grenades.json b/data/mods/Aftershock/items/grenades.json
index 9f192a99efb32..4606c7e8d52d7 100644
--- a/data/mods/Aftershock/items/grenades.json
+++ b/data/mods/Aftershock/items/grenades.json
@@ -207,7 +207,7 @@
     "copy-from": "afs_toxic_grenade",
     "name": "active neurotoxin grenade",
     "looks_like": "grenade_act",
-    "description": "A neurotoxic device that deploys thick swathes of toxic foam upon detonation..  It's currently active.",
+    "description": "A neurotoxic device that deploys thick swathes of toxic foam upon detonation.  It's currently active.",
     "use_action": { "type": "message", "message": "You've already activated the %s, try throwing it instead." },
     "countdown_action": {
       "type": "explosion",
diff --git a/data/mods/Aftershock/maps/furniture_and_terrain/furniture_spaceship_machinery.json b/data/mods/Aftershock/maps/furniture_and_terrain/furniture_spaceship_machinery.json
index 8fcdf8390791f..ce143169d2af6 100644
--- a/data/mods/Aftershock/maps/furniture_and_terrain/furniture_spaceship_machinery.json
+++ b/data/mods/Aftershock/maps/furniture_and_terrain/furniture_spaceship_machinery.json
@@ -48,7 +48,7 @@
   {
     "type": "furniture",
     "id": "f_afs_shuttle_manuevering_thruster",
-    "name": "Multi-axis manuevering thruster",
+    "name": "Multi-axis maneuvering thruster",
     "looks_like": "f_vent",
     "description": "A set of highly maneuverable chemical thrusters used is small to medium spacecraft.",
     "symbol": "0",
diff --git a/data/mods/Aftershock/mobs/robots.json b/data/mods/Aftershock/mobs/robots.json
index b451984a9ac98..42332723c8820 100644
--- a/data/mods/Aftershock/mobs/robots.json
+++ b/data/mods/Aftershock/mobs/robots.json
@@ -383,7 +383,7 @@
     "melee_dice_sides": 6,
     "morale": 20,
     "starting_ammo": { "afs_foamtoxic": 400 },
-    "death_function": { "corpse_type": "BROKEN", "message": "The Croplord crahses into the ground." },
+    "death_function": { "corpse_type": "BROKEN", "message": "The Croplord crashes into the ground." },
     "special_attacks": [
       {
         "type": "gun",
diff --git a/data/mods/Limb_WIP/mutations/mutation_limbs.json b/data/mods/Limb_WIP/mutations/mutation_limbs.json
index c9ccd484b6bf1..9399d84d00279 100644
--- a/data/mods/Limb_WIP/mutations/mutation_limbs.json
+++ b/data/mods/Limb_WIP/mutations/mutation_limbs.json
@@ -310,7 +310,7 @@
     "name": "feathered arm",
     "copy-from": "arm_feathers_l",
     "side": "right",
-    "heading": "feathered right Arm",
+    "heading": "feathered right arm",
     "main_part": "arm_feathers_r",
     "opposite_part": "arm_feathers_l",
     "windage_effect": "winded_arm_r",
diff --git a/data/mods/Magiclysm/npc/TALK_FORGE_HELEN_TAVREL.json b/data/mods/Magiclysm/npc/TALK_FORGE_HELEN_TAVREL.json
index 27f8838c28af8..22146fd0fca64 100644
--- a/data/mods/Magiclysm/npc/TALK_FORGE_HELEN_TAVREL.json
+++ b/data/mods/Magiclysm/npc/TALK_FORGE_HELEN_TAVREL.json
@@ -129,6 +129,6 @@
       ],
       "no": "Well you obviously aren't an officer so here's the deal.  There's a mighty fine galleon making land in <interval>, I'm certain to have something good by then."
     },
-    "responses": [ { "text": "May the seas be ever in your favor", "topic": "TALK_FORGE_LORD_REAGENT" } ]
+    "responses": [ { "text": "May the seas be ever in your favor.", "topic": "TALK_FORGE_LORD_REAGENT" } ]
   }
 ]
diff --git a/data/mods/Megafauna/monsters/mf_domestic.json b/data/mods/Megafauna/monsters/mf_domestic.json
index c0564e63b2a44..cdc4b879cb552 100644
--- a/data/mods/Megafauna/monsters/mf_domestic.json
+++ b/data/mods/Megafauna/monsters/mf_domestic.json
@@ -548,7 +548,7 @@
     "melee_damage": [ { "damage_type": "bash", "amount": 4.0 } ],
     "dodge": 2,
     "fear_triggers": [ "SOUND", "PLAYER_CLOSE", "FIRE" ],
-    "petfood": { "food": [ "CATTLEFOOD" ], "feed": "The %s seems to like you!  It squeals happily as you pet it.." },
+    "petfood": { "food": [ "CATTLEFOOD" ], "feed": "The %s seems to like you!  It squeals happily as you pet it." },
     "flags": [
       "NO_BREED",
       "SEES",
diff --git a/data/mods/MindOverMatter/monsters/triffids.json b/data/mods/MindOverMatter/monsters/triffids.json
index 9e78318b3e580..3712d3ab77a35 100644
--- a/data/mods/MindOverMatter/monsters/triffids.json
+++ b/data/mods/MindOverMatter/monsters/triffids.json
@@ -92,7 +92,7 @@
           "spell_data": { "id": "teleport_slow_monster", "min_level": 8 },
           "cooldown": 15,
           "condition": { "not": { "u_has_effect": "effect_psi_null" } },
-          "monster_message": "%1$s waves its fronds at at %3$s."
+          "monster_message": "%1$s waves its fronds at %3$s."
         },
         {
           "type": "leap",
@@ -109,7 +109,7 @@
           "spell_data": { "id": "teleporter_triffid_summon_allies", "min_level": 10 },
           "cooldown": 35,
           "condition": { "not": { "u_has_effect": "effect_psi_null" } },
-          "monster_message": "%1$s waves its fronds at at %3$s and the air around %3$s solidifies into shapes."
+          "monster_message": "%1$s waves its fronds at %3$s and the air around %3$s solidifies into shapes."
         }
       ]
     }
diff --git a/data/mods/Xedra_Evolved/spells/integrated_armor_spells.json b/data/mods/Xedra_Evolved/spells/integrated_armor_spells.json
index c209731b6320e..5918cfaa41fc1 100644
--- a/data/mods/Xedra_Evolved/spells/integrated_armor_spells.json
+++ b/data/mods/Xedra_Evolved/spells/integrated_armor_spells.json
@@ -17,7 +17,7 @@
     "type": "enchantment",
     "id": "coal_skin_enchantment",
     "name": { "str": "Salamander" },
-    "description": "Your Fire Elemental abilities grant you good resistance to temperature conditions and heat damage.  Also your body emits streams of heat into anyone who attack you,.",
+    "description": "Your Fire Elemental abilities grant you good resistance to temperature conditions and heat damage.  Also your body emits streams of heat into anyone who attack you.",
     "condition": "ALWAYS",
     "values": [
       { "value": "ARMOR_HEAT", "multiply": -0.2 },
@@ -50,7 +50,7 @@
     "type": "enchantment",
     "id": "flame_skin_enchantment",
     "name": { "str": "Salamonstrous" },
-    "description": "Your Fire Elemental abilities grant you good resistance to temperature conditions and heat damage.  Also your body emits streams of heat into anyone who attack you,.",
+    "description": "Your Fire Elemental abilities grant you good resistance to temperature conditions and heat damage.  Also your body emits streams of heat into anyone who attack you.",
     "condition": "ALWAYS",
     "values": [
       { "value": "ARMOR_HEAT", "multiply": -0.5 },
diff --git a/tools/spell_checker/dictionary.txt b/tools/spell_checker/dictionary.txt
index c59c50310e91d..159a02ec4ee36 100644
--- a/tools/spell_checker/dictionary.txt
+++ b/tools/spell_checker/dictionary.txt
@@ -4200,6 +4200,7 @@ neuropsychology
 Neurosoft
 neurostimulators
 neurosynaptic
+neurotoxic
 neurotoxin
 NEURT
 neutrite