| foedus | s. fido |
| folium | foil (n.), foliage, folio, portfolio, tinfoil |
| follis | follicle, folly fool, foolery, foolhardy, foolish, foolishly, foolishness, foolscap |
| fons | font, fount, fountain, fountainhead |
| for | affability, affable, confabulate, defame, enfant, fable, fabulous, faery, fairy, fairyland, fame, famed, famous, fatal, fatality, fatally, fate, fated, fateful, fay, ill-fated, ineffable, infamous, infancy, infant, infantile, infantine, infantry, nefarious, preface, prefatory |
| foris | foreclose, foreign, foreigner, forest, forester, forestry, forfeit, forfeiture |
| forma | conform, conformable, conformation, conformity, couneiform, deform, deformed (adj.), deformity, form, formal, formalism, formality, formality, formation, formless, formula, formulary, formulate, formulation, inform, informal, informally, informant, information, informer, misinform, multiform, platform, re-form, reform, reformation, reformatory, reformer, transform, transformation, trasformer, uniform uniformity, uniformly, vermiform |
| formica | chloroform, formaldehyde |
| formido | formidable |
| fornax | furnace |
| fornix | fornication |
| foro | perforate, perforation |
| fors | fortuitous |
| fortis | fomfirt, comfortable, comfortably, comforter, comfortless, discomfort, effort, enfore, enforceable, enforcement, force, forceful, forcible, forcibly, fort, forte, fortification, fortify, fortitude, fortress, perforce, pianoforte, re-enforce, re-enforcement, reinforce, reinforcement, uncomfortable, uncomfortably, unforced |
| fortuna | fortunate, fortunately, fortune, misfortune, unfortunate, unfortunately |
| forum | forensic |
| foveo | foment |
| fragro | flair, fragrance, fragrant |
| frango | fraction, fractional, fracture, fragile, fragment, fragmentary, frail, frailty, fritter (a fragment), infraction, infringe, infringement, osprey, refract, refraction, refractive, refractory |
| frater | confraternity, fracternal, fraternity, fraternize, friar |
| fraus | defraud, fraud, fraudulent |
| frequens | frequency, frequent, frequently, infrequent, infrequently, unfrequent |
| frico | friction |
| frigo | fritter (in cookery), fry |
| frigus | frigid, refrigerate, refrigeration, refrigerator |
| frio | friable |
| frivolus | frivolity, frivolous |
| frons (frondis) | frond |
| frons (frontis) | affront, confront, effrontery, forefront, front, frontage, frontal, frontier, frontiersman, frontlet, waterfront |
| fruor | fruit, fruitage, fruitful, fruitfulness, fruition, fruitless, grapefruit, unfruitful; s. also frux |
| frustra | frustrate, frustration |
| frux | frugal, frugality; s. also fruor |
| fugio | centrifugal, fugitive, fugue, refuge, refugee, subterfuge |
| fulgeo | effulgence, fulminate, refulgent |
| fullo | foil (verb) |
| fumus | fume, fumigate, perfume, perfumery |
| fundo | confound, confuse, confusedly, confusion, diffuse, diffusion, dumbfound, effuse, effusion, effusive, found (melt), foundry, funnel, fuse, fusion, futile, futility, infuse, infusion, interfuse, profuse, profusely, profusion, refund, refusal, refuse, suffuse, suffusion, transfuse, transfusion |
| fundus | found (originate), foundation, founder, fund, fundamental, fundamentally, ill-founded, profound, profoundly, profundity, unfounded |
| fungor | defunct, function, functional, functionary, perfunctorily, perfunctory |
| fungus | fungous |
| funus | funeralfunereal |
| fur | ferret, furtive, furtively |
| furca | fork, pitchfork |
| furo | furious, furiously, fury, infuriate |
| fusus | fuse (n.) |
| futurus | future |
