| Prefix for flooey | 17 |
| Prefix for flavin | 17 |
| Prefix for fix | 14 |
| Prefix for five | 15 |
| Prefix for fire or rocket | 25 |
| Prefix for final | 16 |
| Prefix for film | 15 |
| Prefix for fiend or angel | 25 |
| Prefix for field or stream | 26 |
| Prefix for fiction | 18 |
| Prefix for feasance | 19 |
| Prefix for fauna or culture | 27 |
| Prefix for fats and plants | 26 |
| Prefix for father | 17 |
| Prefix for farming or soil | 26 |
| Prefix for fall | 15 |
| Prefix for factor or diction | 28 |
| Prefix for esteem, help, etc. | 29 |
| Prefix for element #9 | 21 |
| Prefix for element #33 | 22 |
| Prefix for electric or plane | 28 |
| Prefix for eight | 16 |
| Prefix for economics | 20 |
| Prefix for dyne or drome | 24 |
| Prefix for dynamics or gram | 27 |
| Prefix for dynamics | 19 |
| Prefix for dynamic or space | 27 |
| Prefix for dynamic or nautical | 30 |
| Prefix for dynamic | 18 |
| Prefix for duke or enemy | 24 |
| Prefix for duct | 15 |
| Prefix for drop or fall | 23 |
| Prefix for drome or sol | 23 |
| Prefix for drome or dynamics | 28 |
| Prefix for drome | 16 |
| Prefix for dox or pedic | 23 |
| Prefix for dox | 14 |
| Prefix for dote or freeze | 25 |
| Prefix for dome or turf | 23 |
| Prefix for dollars | 18 |
| Prefix for dollar or Disney | 27 |
| Prefix for dollar | 17 |
| Prefix for distant or lateral | 29 |
| Prefix for distant | 18 |
| Prefix for distance | 19 |
| Prefix for disposition | 22 |
| Prefix for Disney | 17 |
| Prefix for disestablishmentarianism | 35 |
| Prefix for disestablish-mentarianism | 36 |
| Prefix for dimensional | 22 |
| Prefix for diluvian | 19 |
| Prefix for dextrous | 19 |
| Prefix for detached | 19 |
| Prefix for dermis | 17 |
| Prefix for derm or plasm | 24 |
| Prefix for derm or gram | 23 |
| Prefix for dent or color | 24 |
| Prefix for demisemiquaver, in music | 35 |
| Prefix for demic or gram | 24 |
| Prefix for demic | 16 |
| Prefix for deed or take | 23 |
| Prefix for deal or deed | 23 |
| Prefix for day or week | 22 |
| Prefix for day or way | 25 |
| Prefix for day or night | 23 |
| Prefix for date or room | 23 |
| Prefix for date or diluvian | 27 |
| Prefix for date or cede | 23 |
| Prefix for dactyl | 17 |
| Prefix for cycle or verse | 25 |
| Prefix for cycle or sex | 23 |
| Prefix for cycle or phone | 25 |
| Prefix for cycle or form | 24 |
| Prefix for cycle or dent | 24 |
| Prefix for cycle or centennial | 30 |
| Prefix for cycle or angle | 25 |
| Prefix for cycle | 16 |
| Prefix for cute | 15 |
| Prefix for cut or type | 22 |
| Prefix for cure or tome | 23 |
| Prefix for cure or graph | 24 |
| Prefix for culture or business | 30 |
| Prefix for culture | 18 |
| Prefix for crine or carp | 24 |
| Prefix for credit | 17 |
| Prefix for crat | 15 |
| Prefix for corn or verse | 24 |
| Prefix for corn or pod | 22 |
| Prefix for corn or meter | 24 |
| Prefix for corn or form | 23 |
| Prefix for corn or cycle | 24 |
| Prefix for corn or angle | 24 |
| Prefix for corn | 15 |
| Prefix for copter or port | 25 |
| Prefix for copter | 17 |
| Prefix for content | 18 |
| Prefix for conservative or classic | 34 |
| Prefix for conformist or entity | 31 |
| Prefix for conference | 21 |
| Prefix for commuter | 19 |