| Prefix for communication | 24 |
| Prefix for comic or comedy | 26 |
| Prefix for comic | 16 |
| Prefix for comedy | 17 |
| Prefix for color or cycle | 25 |
| Prefix for color | 16 |
| Prefix for coastal or mural | 27 |
| Prefix for climactic | 20 |
| Prefix for classics | 19 |
| Prefix for classicist | 21 |
| Prefix for classicism or conservatism | 37 |
| Prefix for classical, Freudian or Latin | 39 |
| Prefix for classical or Latin | 29 |
| Prefix for classical or conservative | 36 |
| Prefix for classical | 20 |
| Prefix for classic or colonial | 30 |
| Prefix for circle | 17 |
| Prefix for chute or phrase | 26 |
| Prefix for chute or medic | 25 |
| Prefix for chute or graph | 25 |
| Prefix for chute | 16 |
| Prefix for chord or meter | 25 |
| Prefix for chord | 16 |
| Prefix for China or European | 28 |
| Prefix for China | 16 |
| Prefix for chemistry and physics | 32 |
| Prefix for chemistry | 20 |
| Prefix for chemical | 19 |
| Prefix for charge | 17 |
| Prefix for change | 17 |
| Prefix for chamber | 18 |
| Prefix for centric | 18 |
| Prefix for Centre or gram | 25 |
| Prefix for center or log | 24 |
| Prefix for center or graph | 26 |
| Prefix for center or gram | 25 |
| Prefix for center | 17 |
| Prefix for centennial | 21 |
| Prefix for cent or adventure | 28 |
| Prefix for cede | 15 |
| Prefix for cease or charge | 26 |
| Prefix for caust | 16 |
| Prefix for cast or head | 23 |
| Prefix for cast | 15 |
| Prefix for carp or crine | 24 |
| Prefix for care | 15 |
| Prefix for carbon or scope | 26 |
| Prefix for Caps or Cat | 22 |
| Prefix for camp or van | 22 |
| Prefix for calling | 18 |
| Prefix for call or cop | 22 |
| Prefix for byte meaning "one billion" | 47 |
| Prefix for byte | 15 |
| Prefix for business or culture | 30 |
| Prefix for bus or skirt | 23 |
| Prefix for bus or science | 25 |
| Prefix for bus or present | 25 |
| Prefix for bus or potent | 24 |
| Prefix for bus | 14 |
| Prefix for bucks | 16 |
| Prefix for buck | 15 |
| Prefix for brewery | 18 |
| Prefix for both | 15 |
| Prefix for body or type | 23 |
| Prefix for body or tank | 23 |
| Prefix for body | 15 |
| Prefix for bodies | 17 |
| Prefix for blended families | 27 |
| Prefix for blast or carp | 24 |
| Prefix for biology | 18 |
| Prefix for bellum or date | 25 |
| Prefix for bellum | 17 |
| Prefix for bat or phobia | 24 |
| Prefix for bat or nym | 21 |
| Prefix for barbital | 19 |
| Prefix for bar or therm | 23 |
| Prefix for bar or gram | 22 |
| Prefix for bar | 14 |
| Prefix for band or dict | 23 |
| Prefix for ballistic | 20 |
| Prefix for automatic | 20 |
| Prefix for atmosphere | 21 |
| Prefix for athlete | 18 |
| Prefix for Asian land | 21 |
| Prefix for Asian | 16 |
| Prefix for Asia | 15 |
| Prefix for Arthur or Donald | 27 |
| Prefix for arctic or eater | 26 |
| Prefix for arctic | 17 |
| Prefix for arch or lineal | 25 |
| Prefix for appropriation | 24 |
| Prefix for angular | 18 |
| Prefix for angle or pod | 23 |
| Prefix for angle or lateral | 27 |
| Prefix for angle or cycle | 25 |
| Prefix for angle or corn | 24 |
| Prefix for angle or color | 25 |
| Prefix for angle and pod | 24 |
| Prefix for angle and color | 26 |
| Prefix for angle | 16 |