| ça | 1 cabaret |
| cabillaud | 2 cabot |
| cabri | cacao |
| cachexie | cacolet |
| cadeau | cadien, ienne |
| caduc, caduque | cafournion |
| cagna | cagouille |
| caïd | 2 caillette |
| caisse | cal |
| 1 calandre | calcifier |
| calebasse | calendes |
| calfater | câliner |
| 1 calme | calotte |
| calypso | camaron |
| cambrioleur, euse | camélia |
| camériste | camomille |
| campanile | canadien, ienne |
| 1 canari | candélabre |
| caner | cangue |
| caniveau | cannetille |
| cañon | cantal |
| cantique | caoua |
| capelan | capitation |
| capituler | cappuccino |
| capter | capucin, ine |
| 1 car | caracoler |
| caramel | caravansérail |
| carbure | cardamome |
| carence | carguer |
| carie | carmin |
| carné, ée | carotte |
| carpette | 1 carrière |
| carrure | 2 cartouche |
| casaque | casemate |
| casoar | 2 casseau, |
| 2 cassis | caste |
| cataclysme | catalogue |
| catarrhe | catelle |
| catimini (en) | cauchemar |
| caustique | cavalier, ière |
| caverne | Céans |
| cédille | céladon |
| célestin, ine | celte |
| 1 -cène | censé, ée |
| centre | céramique |
| céréale | cerne |
| cerveau | césure |
| C. F. A., | chabrol, chabrot |
| chafouin, ine | chaîne |
| 1 chaland | châlit |
| chamade | chambranle |
| champagne | champlure |
| chandeleur | chanoine |
| chantourner | chapeau |
| chapon | charançon |
| charisme | 1 charlotte |
| charnier | charroi |
| 1 châsse | chaste |
| chateaubriand, châteaubriant | chat-pard |
| chaufour | chaut |
| cheap | cheddar |
| chélidoine | chenapan |
| chenu, ue | chérif |
| chevet | chèvrefeuille |
| chiader | chic |
| 1 chiche | chicot |
| chiffe | chile |
| 1 chiner | chiper |
| chique | chlamyde |
| chocolat | choke |
| chopine | chorizo |
| chouan | chouia, chouïa, chouya |
| chrétien, ienne | chrome |
| chtimi | chut |
| 2 ci | cicerone |
| cigale | cimaise |
| cinématique | cipaille |
| circonlocution | circulaire |
| cisalpin | citadelle |
| citoyen | civil, ile |
| clair, claire | clapet |
| clarinette | clause |
| clebs | cleptomane |
| cligner | clipper |
| 1 clocher | clopet |
| clown | coaguler |
| cob | cocard, coquard, coquart |
| 4 coche | cocker |
| 4 coco | cocu, e |
| cœur | cognition |
| coiffe | 1 coke |
| cold-cream | colimaçon |
| collaborer | collège |
| collimateur | 1 colloquer |
| colombage | côlon |
| coloquinte | colvert |
| combiner | comédon |
| commander | commensurable |
| comminatoire | commodore |
| communier | compagnon |
| compassion | compiler |
| complexion | comporter |
| compresser | comte |
| concentrer | concetti |
| concis, ise | concorder |
| condamner | condoléance |
| cône | confidence |
| confisquer | conforter |
| congé | congratuler |
| conjoindre | connaître |
| conopée | conscrit |
| conserver | consolider |
| consoude | constiper |
| consulter | contempler |
| contester | continuer |
| contradicteur, contradiction | contravention |
| contrée | contrepoint |
| contrôle | convection |
| convergent, ente | convive |
| convulser | copal |
| coprin | coque |
| coquille | corbeille |
| cordillère | cornac |
| corner | cornu, ue |
| corozo | corrélation |
| corroder | cortège |
| cosaque | 1 cosmos |
| cot cot, | cothurne |
| coton | couard |
| couenne | cougourde |
| couleur | country |
| couperose | courage |
| couronne | course |
| 1 courtine | coussin |
| coutume | cover-girl |
| 1 crack | craindre |
| crampe | 1 crapet |
| crasse | crayon |
| crédit | crémation |
| crêper | crescendo |
| cretonne | 1 cri |
| crime | crisper |
| 2 critique | croire |
| crolle | cross |
| crotte | crousille |
| 1 cru, crue | crucifier |
| crustacé, ée | cube |
| cuir | cuivre |
| culpabilité | cumulus |
| curable | curer |
| cursus | cutter |
| 2 Cycle | cyme |
| cyprin | czardas |