fab-o = bean (leguminous fruit).
fabel-o = story, tale.
fabl-o = fable.
fabrik-i = to manufacture.
facil-a = easy.
faden-o = thread.
fajf-i = to whistle.
fajr-o = fire.
fak-o = department, specialty.
fakt-o = fact.
fal-i = to fall.
fald-i = to fold.
fals-i = to falsify, forge, debase.
fam-o = fame, renown, rumor.
famili-o = family.
familiar-a = familiar, accustomed.
fand-i = (trans.), to smelt, fuse (metals, etc.).
fanfaron-i = to boast, vaunt oneself, brag.
fantom-o = phantom, ghost.
far-i = to make, do, render.
faraon-o = pharaoh (Egyptian ruler).
farm-i = to farm (as a tenant).
farmaci-o = pharmacy (knowledge of the use of drugs).
fart-i = to be in (good or bad) health.
farun-o = flour.
fask-o = bundle, bunch.
fason-o = cut, mode, fashion.
fatal-a = fatal, predestined.
fauxk-o = jaw (literal and figurative).
favor-a = favorable.
fazeol-o = bean (garden bean).
fe-o = fairy, fay; --ino, fairy.
febr-o = fever.
februar-o = February.
fel-o = skin, hide (of animals).
felicx-a = happy.
femur-o = thigh.
fend-i = (trans.), to split.
fenestr-o = window.
fer-o = iron; --vojo, railway.
ferdek-o = deck (of ship).
ferm-i = (trans.), to close, shut.
fervor-o = zeal, fervor.
fest-i = to celebrate.
festen-o = banquet.
fi = (interjection), fie! (273).
fiakr-o = cab.
fiancx-o = betrothed man, fiance.
fid-i = to rely upon, trust.
fidel-a = faithful, loyal.
fier-a = proud, haughty.
fil-o = son.
filozof-o = philosopher.
fin-i = (trans.), to finish, end.
fingr-o = finger; "dika fingro", thumb; "montra fingro", index finger;
"longa fingro", middle finger; "ringa fingro", ring-finger;
"malgranda fingro", little finger.
firm-a = firm, steady.
fisx-o = fish.
fizik-o = physics, physical science.
flag-o = flag, banner, small standard.
flank-o = side.
flar-i = (trans.), to smell, scent.
flav-a = yellow.
fleks-i = (trans.), to bend, flex.
flik-i = to patch.
flor-o = flower (116).
flu-i = to flow.
flug-i = to fly.
fluid-a = fluid, liquid.
foj-o = time, occasion (127).
fojn-o = hay.
fokus-o = focus.
foli-o = leaf.
fond-i = to found, establish.
font-o = spring (of water), fount.
fontan-o = fountain (artificial).
for = (adv.), away (71).
forges-i = to forget.
fork-o = fork.
form-o = shape, form.
formik-o = ant.
forn-o = stove.
fort-a = strong.
fos-i = to dig.
fotograf-i = to photograph
frag-o = strawberry.
frak-o = evening dress (for men).
frakas-i = to shatter, break to pieces.
framb-o = raspberry.
franc-o = Frenchman.
frand-i = to be fond of sweets, be an epicure.
frangx-o = fringe.
frap-i = to knock, strike.
frat-o = brother.
frauxl-o = bachelor, unmarried man.
fraz-o = sentence, phrase.
Frederik-o = Frederick.
fremd-a = foreign.
frenez-a = crazy, mad.
fresx-a = fresh, new.
fripon-o = rogue, rascal, knave.
frit-i = (trans.), to fry.
fromagx-o = cheese.
frost-o = frost.
frot-i = to rub.
fru-a = early.
frukt-o = fruit.
frunt-o = forehead.
fulm-o = lightning.
fum-i = to smoke.
fund-o = bottom.
fundament-o = foundation, base.
funebr-o = mourning.
fung-o = mushroom.
funkci-i = to function, work.
funt-o = pound.
furioz-a = furious, raging.
fusx-i = to bungle.
fut-o = foot (measure).