| Prefix with financing or economics | 34 |
| Prefix with fire | 16 |
| Prefix with fire or choir | 25 |
| Prefix with fire or print | 25 |
| Prefix with firm and form | 25 |
| Prefix with fit | 15 |
| Prefix with fix | 15 |
| Prefix with fix or fuse | 23 |
| Prefix with flooey or flop | 26 |
| Prefix with flop | 16 |
| Prefix with flop or plop | 24 |
| Prefix with flow | 16 |
| Prefix with fluid or toxin | 26 |
| Prefix with fluoride | 20 |
| Prefix with foam | 16 |
| Prefix with focal | 17 |
| Prefix with focus | 17 |
| Prefix with foil | 16 |
| Prefix with foil or pan | 23 |
| Prefix with foil or phobia | 26 |
| Prefix with foil or plane | 25 |
| Prefix with fold | 16 |
| Prefix with fold or dent | 24 |
| Prefix with fold or level | 25 |
| Prefix with foot or faced | 25 |
| Prefix with footprint | 21 |
| Prefix with force and form | 26 |
| Prefix with form | 16 |
| Prefix with form or cell | 24 |
| Prefix with form or corn | 24 |
| Prefix with form or cycle | 25 |
| Prefix with form or fume | 24 |
| Prefix with form or phyll | 25 |
| Prefix with form or port | 24 |
| Prefix with form or sex | 23 |
| Prefix with form or spire | 25 |
| Prefix with form or verse | 25 |
| Prefix with fortune or name | 27 |
| Prefix with freak | 17 |
| Prefix with freak or friendly | 29 |
| Prefix with freeze | 18 |
| Prefix with freeze or hero | 26 |
| Prefix with freeze or knock | 27 |
| Prefix with Freudian | 20 |
| Prefix with friendly | 20 |
| Prefix with friendly or conscious | 33 |
| Prefix with friendly or warrior | 31 |
| Prefix with frost | 17 |
| Prefix with fuel | 16 |
| Prefix with function | 20 |
| Prefix with function or peptic | 30 |
| Prefix with functional | 22 |
| Prefix with fuse or fraction | 28 |
| Prefix with geek | 16 |
| Prefix with genarian | 20 |
| Prefix with genesis | 19 |
| Prefix with genetic | 19 |
| Prefix with genital | 19 |
| Prefix with Germanic | 20 |
| Prefix with glider | 18 |
| Prefix with gliding | 19 |
| Prefix with globin | 18 |
| Prefix with gloss | 17 |
| Prefix with glottal | 19 |
| Prefix with glottis | 19 |
| Prefix with glottis or gram | 27 |
| Prefix with glycemic | 20 |
| Prefix with glyceride | 21 |
| Prefix with glycerine | 21 |
| Prefix with glyph | 17 |
| Prefix with glyphic | 19 |
| Prefix with god | 15 |
| Prefix with god or goddess | 26 |
| Prefix with god or john | 23 |
| Prefix with goddess | 19 |
| Prefix with gon | 15 |
| Prefix with grade | 17 |
| Prefix with grade and active | 28 |
| Prefix with grade or cede | 25 |
| Prefix with grade or rocket | 27 |
| Prefix with grain | 17 |
| Prefix with grain and lane | 26 |
| Prefix with gram | 16 |
| Prefix with gram and logue | 26 |
| Prefix with gram or buoy | 24 |
| Prefix with gram or center | 26 |
| Prefix with gram or dyne | 24 |
| Prefix with gram or graph | 25 |
| Prefix with gram or liter | 25 |
| Prefix with gram or logical | 27 |
| Prefix with gram or logue | 25 |
| Prefix with gram or marketing | 29 |
| Prefix with gram or meter | 25 |
| Prefix with gram or sode | 24 |
| Prefix with gram or style | 25 |
| Prefix with gram or train | 25 |
| Prefix with gram or tribe | 25 |
| Prefix with gram or type | 24 |
| Prefix with grammatical | 23 |
| Prefix with gramme | 18 |