| Prefix for fiend or angel | 25 |
| Prefix for film | 15 |
| Prefix for final | 16 |
| Prefix for fire or rocket | 25 |
| Prefix for five | 15 |
| Prefix for fix | 14 |
| Prefix for flavin | 17 |
| Prefix for flooey | 17 |
| Prefix for foam | 15 |
| Prefix for focal | 16 |
| Prefix for focus | 16 |
| Prefix for foil | 15 |
| Prefix for foil or chloride | 27 |
| Prefix for fold or graph | 24 |
| Prefix for form | 15 |
| Prefix for form or corn | 23 |
| Prefix for form or cycle | 24 |
| Prefix for form or sex | 22 |
| Prefix for form or verse | 24 |
| Prefix for fraction | 19 |
| Prefix for freak | 16 |
| Prefix for freeze | 17 |
| Prefix for friendly | 19 |
| Prefix for fuel | 15 |
| Prefix for function | 19 |
| Prefix for functional | 21 |
| Prefix for geek or mensch | 25 |
| Prefix for giving or taking | 27 |
| Prefix for globin or stat | 25 |
| Prefix for glycerin | 19 |
| Prefix for goblin | 17 |
| Prefix for god or john | 22 |
| Prefix for god or monde | 23 |
| Prefix for gothic or classic | 28 |
| Prefix for grade | 16 |
| Prefix for grade or active | 26 |
| Prefix for graduate or handed | 29 |
| Prefix for gram | 15 |
| Prefix for gram and bar | 23 |
| Prefix for gram and cure | 24 |
| Prefix for gram and phone | 25 |
| Prefix for gram or drome | 24 |
| Prefix for gram or dyne | 23 |
| Prefix for gram or glotis | 25 |
| Prefix for gram or logical | 26 |
| Prefix for gram or logue | 24 |
| Prefix for gram or lytic | 24 |
| Prefix for gram or meter | 24 |
| Prefix for gram or naut | 23 |
| Prefix for gram or nautical | 27 |
| Prefix for gram or pest | 23 |
| Prefix for gram or tone | 23 |
| Prefix for gram or vision | 25 |
| Prefix for graph | 16 |
| Prefix for graph or harp | 24 |
| Prefix for graph or logical | 27 |
| Prefix for graph or medic | 25 |
| Prefix for graph or resin | 25 |
| Prefix for graph or trooper | 27 |
| Prefix for graph or type | 24 |
| Prefix for graph or vision | 26 |
| Prefix for graphic | 18 |
| Prefix for graphy | 17 |
| Prefix for gravure | 18 |
| Prefix for hap or deed | 22 |
| Prefix for hazard | 17 |
| Prefix for head or lap | 22 |
| Prefix for hero | 15 |
| Prefix for hero or knock | 24 |
| Prefix for hit or dose | 22 |
| Prefix for hood or handle | 25 |
| Prefix for iliac | 16 |
| Prefix for Impressionism | 24 |
| Prefix for inflammatory | 23 |
| Prefix for john or god | 22 |
| Prefix for lateral | 18 |
| Prefix for lateral or distant | 29 |
| Prefix for lateral or librium | 29 |
| Prefix for lay or play | 22 |
| Prefix for legal | 16 |
| Prefix for legal or chute | 25 |
| Prefix for legal or medic | 25 |
| Prefix for legal or normal | 26 |
| Prefix for legal or sailing | 27 |
| Prefix for liberal or conservative | 34 |
| Prefix for life or wife | 23 |
| Prefix for light | 16 |
| Prefix for light or night | 25 |
| Prefix for linear | 17 |
| Prefix for lingual | 18 |
| Prefix for lithic | 17 |
| Prefix for lithic or plastic | 28 |
| Prefix for lock | 15 |
| Prefix for lock or view | 23 |
| Prefix for log or gram | 22 |
| Prefix for logic or centric | 27 |
| Prefix for logical | 18 |
| Prefix for logical or gram | 26 |
| Prefix for logical or motor | 27 |
| Prefix for logy and nomics | 26 |