| Prefix with com or change | 25 |
| Prefix with con or classical | 28 |
| Prefix with con or cortex | 25 |
| Prefix with conference | 22 |
| Prefix with conferencing | 24 |
| Prefix with conformist | 22 |
| Prefix with conservative | 24 |
| Prefix with continental | 23 |
| Prefix with cook or heat | 24 |
| Prefix with cool or cook | 24 |
| 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 corporation | 23 |
| Prefix with cortex or classic | 29 |
| Prefix with cruiser or sphere | 29 |
| Prefix with culture or fauna | 28 |
| 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 date or cede | 24 |
| Prefix with date or chamber | 27 |
| Prefix with date or dawn | 24 |
| Prefix with date or nave | 24 |
| Prefix with day or land | 23 |
| Prefix with day or night | 24 |
| Prefix with day or way | 22 |
| Prefix with day or year | 23 |
| Prefix with deed or lead | 24 |
| Prefix with demisemiquaver | 26 |
| Prefix with dent or pod | 23 |
| Prefix with dent or sect | 24 |
| Prefix with derm or therm | 25 |
| Prefix with dermis or glottis | 29 |
| Prefix with determined | 22 |
| Prefix with dimensional | 23 |
| Prefix with directional | 23 |
| Prefix with Disney or dollar | 28 |
| Prefix with dollar or trash | 27 |
| Prefix with dose or ton | 23 |
| Prefix with drome and thesis | 28 |
| Prefix with drome or dynamics | 29 |
| Prefix with drome or space | 26 |
| Prefix with duct or form | 24 |
| Prefix with duct or raptor | 26 |
| Prefix with duct or sac | 23 |
| Prefix with duke or deacon | 26 |
| Prefix with dynamic and space | 29 |
| Prefix with dynamic or space | 28 |
| Prefix with dynamics or sol | 27 |
| Prefix with dyne or sol | 23 |
| Prefix with dyne or stat | 24 |
| Prefix with east or west | 24 |
| Prefix with efficiency | 22 |
| Prefix with ego or hero | 23 |
| Prefix with engineering | 23 |
| Prefix with epinephrine | 23 |
| Prefix with European or China | 29 |
| Prefix with expressionism | 25 |
| Prefix with face or faith | 25 |
| Prefix with family or room | 26 |
| Prefix with fan or jet | 22 |
| Prefix with fat or fix | 22 |
| Prefix with figure or form | 26 |
| Prefix with film or scope | 25 |
| Prefix with final or trailer | 28 |
| Prefix with fire or choir | 25 |
| Prefix with fire or print | 25 |
| Prefix with firm and form | 25 |
| Prefix with fix or fuse | 23 |
| Prefix with flooey or flop | 26 |
| Prefix with flop or plop | 24 |
| Prefix with fluid or toxin | 26 |
| Prefix with foil or pan | 23 |
| Prefix with foil or phobia | 26 |
| Prefix with foil or plane | 25 |
| Prefix with fold or dent | 24 |
| Prefix with fold or level | 25 |
| Prefix with foot or faced | 25 |
| Prefix with force and form | 26 |
| Prefix with form or cell | 24 |
| Prefix with form or corn | 24 |
| Prefix with form or cycle | 25 |