| Certain foot | 12 |
| Certain foot specialist | 23 |
| Certain football lineup | 23 |
| Certain football pass | 21 |
| Certain football passes | 23 |
| Certain football position | 25 |
| Certain football positions (Abbr.) | 34 |
| Certain football score | 22 |
| Certain footnote | 16 |
| Certain footwear | 16 |
| Certain forced bet | 18 |
| Certain Ford models | 19 |
| Certain Ford, briefly | 21 |
| Certain Ford, for short | 23 |
| Certain Ford, once | 18 |
| Certain Fords | 13 |
| Certain foreign dignitary | 25 |
| Certain foreign leader | 22 |
| Certain foreign leader (Var.) | 29 |
| Certain foreign policy | 22 |
| Certain forerunner of the euro | 30 |
| Certain forest areas | 20 |
| Certain form numbers | 20 |
| Certain form of protest | 23 |
| Certain formalwear, informally | 30 |
| Certain former senior | 21 |
| Certain former soldiers | 23 |
| Certain Formosan bank deposit | 29 |
| Certain forms of protest | 24 |
| Certain fossil fuel | 19 |
| Certain foul balls | 18 |
| Certain foundation | 18 |
| Certain four-sided figures | 26 |
| Certain four-stringers, briefly | 31 |
| Certain four-wheeler, for short | 31 |
| Certain four-year period | 24 |
| Certain fowl | 12 |
| Certain fractions | 17 |
| Certain fractions: Abbr. | 24 |
| Certain fragrant wood | 21 |
| Certain frameworks | 18 |
| Certain frat boy | 16 |
| Certain frat man, for short | 27 |
| Certain fraternal order member | 30 |
| Certain fraternity activity | 27 |
| Certain fraternity chapter | 26 |
| Certain fraternity man, informally | 34 |
| Certain fraternity member, casually | 35 |
| Certain fraternity men | 22 |
| Certain fraud investigator, informally | 38 |
| Certain freak | 13 |
| Certain free radical | 20 |
| Certain free rider | 18 |
| Certain freight shipment | 24 |
| Certain freight train | 21 |
| Certain French cheese | 21 |
| Certain French meat | 19 |
| Certain French oils | 19 |
| Certain French paintings | 24 |
| Certain French wines | 20 |
| Certain Frenchman | 17 |
| Certain freshener | 17 |
| Certain freshman | 16 |
| Certain freshmen | 16 |
| Certain freshwater fish | 23 |
| Certain fricassee | 17 |
| Certain Friday | 14 |
| Certain fringe | 14 |
| Certain frosh | 13 |
| Certain frozen dessert | 22 |
| Certain frozen foods | 20 |
| Certain frozen waffles | 22 |
| Certain fruit container | 23 |
| Certain fruit stones | 20 |
| Certain fruit that's not quite ripe | 39 |
| Certain fruity liquor | 21 |
| Certain frying pan | 18 |
| Certain frypan | 14 |
| Certain fuel carrier | 20 |
| Certain fuel source | 19 |
| Certain fuel storage locale | 27 |
| Certain fuel, to a Brit | 23 |
| Certain fugitive | 16 |
| Certain full house, in poker lingo | 34 |
| Certain functionary | 19 |
| Certain fund | 12 |
| Certain fund-raiser | 19 |
| Certain fundraiser | 18 |
| Certain funds | 13 |
| Certain fungus | 14 |
| Certain fur | 11 |
| Certain fur pieces | 18 |
| Certain fur source | 18 |
| Certain furbearer | 17 |
| Certain furniture ensembles | 27 |
| Certain furs | 12 |
| Certain futurist | 16 |
| Certain G.I. | 12 |
| Certain G.I. cards | 18 |
| Certain G.I.'s | 18 |