| Prefix with classic or Latin | 28 |
| Prefix with classic or mycin | 28 |
| Prefix with classic or natal | 28 |
| Prefix with classic or Platonic | 31 |
| Prefix with classical | 21 |
| Prefix with classicism | 22 |
| Prefix with climate | 19 |
| Prefix with clinic | 18 |
| Prefix with coastal | 19 |
| Prefix with coastal or mural | 28 |
| Prefix with colon or formal | 27 |
| Prefix with colonial | 20 |
| Prefix with colonial or conservative | 36 |
| Prefix with colonialism | 23 |
| Prefix with color | 17 |
| Prefix with color or chord | 26 |
| Prefix with color or corn | 25 |
| Prefix with color or cycle | 26 |
| Prefix with color or tone | 25 |
| Prefix with colored | 19 |
| Prefix with Columbian | 21 |
| Prefix with com | 15 |
| Prefix with com or change | 25 |
| Prefix with comedy | 18 |
| Prefix with comic | 17 |
| Prefix with commute | 19 |
| Prefix with commuter or computer | 32 |
| Prefix with commuting | 21 |
| Prefix with con | 15 |
| Prefix with con or classical | 28 |
| Prefix with con or cortex | 25 |
| Prefix with concert | 19 |
| Prefix with conductor | 21 |
| Prefix with conductor or trailer | 32 |
| Prefix with cone | 16 |
| Prefix with conference | 22 |
| Prefix with conference or commute | 33 |
| Prefix with conferencing | 24 |
| Prefix with conformist | 22 |
| Prefix with conscious | 21 |
| Prefix with conscious or colon | 30 |
| Prefix with conservative | 24 |
| Prefix with conservative or liberal | 35 |
| Prefix with conservative or natal | 33 |
| Prefix with conservative or orthodox | 36 |
| Prefix with consumer | 20 |
| Prefix with consumer or catastrophe | 35 |
| Prefix with content | 19 |
| Prefix with continental | 23 |
| Prefix with cook or heat | 24 |
| Prefix with cool | 16 |
| Prefix with cool or cook | 24 |
| Prefix with cop, in a film title | 32 |
| Prefix with copier | 18 |
| Prefix with corn | 16 |
| Prefix with corn and form | 25 |
| Prefix with corn or color | 25 |
| Prefix with corn or cycle | 25 |
| Prefix with corn or dent | 24 |
| Prefix with corn or form | 24 |
| Prefix with corn or pod | 23 |
| Prefix with corn or sex | 23 |
| Prefix with corn or verse | 25 |
| Prefix with corn, form, or cycle | 32 |
| Prefix with corporation | 23 |
| Prefix with correct | 19 |
| Prefix with correct, in texting | 31 |
| Prefix with cortex | 18 |
| Prefix with cortex or classic | 29 |
| Prefix with cortical | 20 |
| Prefix with county | 18 |
| Prefix with course | 18 |
| Prefix with cross | 17 |
| Prefix with cruiser or sphere | 29 |
| Prefix with cultural | 20 |
| Prefix with culture | 19 |
| Prefix with culture or fauna | 28 |
| Prefix with cumulus | 19 |
| Prefix with cure | 16 |
| Prefix with cycle | 17 |
| Prefix with cycle and sex | 25 |
| Prefix with cycle or angle | 26 |
| Prefix with cycle or athlete | 28 |
| Prefix with cycle or city | 25 |
| Prefix with cycle or dent | 25 |
| Prefix with cycle or focal | 26 |
| Prefix with cycle or form | 25 |
| Prefix with cycle or lateral | 28 |
| Prefix with cycle or meter | 26 |
| Prefix with cycle or plane | 26 |
| Prefix with cycle or pod | 24 |
| Prefix with cycle or sex | 24 |
| Prefix with cycle or sphere | 27 |
| Prefix with cycle or ton | 24 |
| Prefix with cycle or verse | 26 |
| Prefix with cyclist | 19 |
| Prefix with dactyl | 18 |
| Prefix with dairy | 17 |
| Prefix with Darwinism or Marxism | 32 |
| Prefix with data | 16 |