| 1247 | coordinate |
| 1829 | cooperation |
| 2995 | coolant |
| 554 | copy |
| 1205 | cope |
| 1322 | copper |
| 2056 | copyright |
| 620 | core |
| 734 | correct |
| 1465 | correspond |
| 1549 | corporation |
| 2571 | cord |
| 2585 | corridor |
| 2646 | corrosion |
| 3239 | cork |
| 1038 | cosmic |
| 134 | cost |
| 1982 | cotton |
| 44 | course |
| 77 | count |
| 205 | council |
| 803 | court |
| 836 | couple |
| 1687 | counter |
| 1781 | counterpart |
| 2355 | county |
| 2413 | cousin |
| 2581 | courtesy |
| 3052 | courage |
| 3240 | couch |
| 3241 | cough |
