fortuity vs. stroke
fizzle vs. sibilation
fadeout vs. receding
footfall vs. step
freshet vs. spate
footrace vs. run
fertilization vs. impregnation
fertilisation vs. impregnation
fecundation vs. impregnation
frisson vs. shudder
fervor vs. inflammation
fervour vs. inflammation
febrility vs. fever
febricity vs. fever
fever vs. pyrexia
fever vs. feverishness
fidget vs. restlessness
fidgetiness vs. restlessness
fear vs. veneration
fear vs. reverence
forlornness vs. loneliness
fretfulness vs. irritability
fruitcake vs. screwball
fritter vs. shoot
frosting vs. icing
flapcake vs. pancake
flapjack vs. pancake
frappe vs. ice
fryer vs. pullet
frier vs. pullet
fettuccine vs. fettuccini
fennel vs. finocchio
feed vs. provender
feed vs. fertilize
feed vs. fertilise
feed vs. give
feed vs. prey
feed vs. run
flavorer vs. seasoning
flavourer vs. seasoning
flavoring vs. seasoning
flavouring vs. seasoning
falafel vs. felafel
fondu vs. fondue
fizz vs. sparkle
foursome vs. quartet
fivesome vs. quintet
fivesome vs. quintette
family vs. house
family vs. fellowship
family vs. mob
family vs. syndicate
flock vs. troop
flock vs. sight
frat vs. fraternity
filmdom vs. screen
fund vs. stock
faction vs. sect
fellowship vs. society
farrago vs. ragbag
forest vs. wood
forest vs. timber
fatherland vs. homeland
fatherland vs. motherland
farmland vs. tillage
flake vs. snowflake
flake vs. peel
fomite vs. vehicle
foreland vs. head
fireball vs. powerhouse
fiord vs. fjord
foam vs. froth
foam vs. sparkle
froth vs. sparkle
froth vs. suds
fen vs. marsh
fenland vs. marsh
falls vs. waterfall
fairy vs. queen
fiend vs. monster
freak vs. nut
freak vs. monster
fornicatress vs. jade
fawner vs. truckler
fellow vs. mate
feller vs. lumberjack
fry vs. nestling
fool vs. sap
fool vs. jester
fool vs. gull
fool vs. shoot
felon vs. whitlow
fop vs. gallant
father vs. sire
father vs. founder
father vs. get
fuckhead vs. hammerhead
foe vs. opposition
foeman vs. opposition
flautist vs. flutist
financier vs. moneyman
farmer vs. husbandman
farmer vs. granger
farmer vs. sodbuster
farmhand vs. fieldhand
fink vs. squeal
fink vs. rat
fondler vs. petter
farrier vs. horseshoer
footpad vs. padder
forbear vs. forebear
forbear vs. refrain
forecaster vs. predictor
forefather vs. sire
foreigner vs. outsider
fishmonger vs. fishwife
fencer vs. swordsman
forelady vs. forewoman
fielder vs. fieldsman
fakeer vs. fakir
fakir vs. faqir
fakir vs. faquir
flogger vs. scourger
falangist vs. phalangist
floorwalker vs. shopwalker
falconer vs. hawker
faller vs. lumberjack
flunky vs. stooge
flunkey vs. flunky
flunky vs. lackey
flunkey vs. stooge
finagler vs. wangler
founder vs. laminitis
founder vs. submerge
founder vs. submerse
fille vs. miss
freedman vs. freedwoman
freelancer vs. independent
freeman vs. freewoman
friar vs. mendicant
footslogger vs. infantryman
firebrand vs. instigator
fencesitter vs. independent
fossilist vs. paleontologist
functionary vs. official
frequenter vs. patron
forgiver vs. pardoner
freebooter vs. spoiler
flouter vs. mocker
fibber vs. storyteller
fabricator vs. storyteller
floozy vs. hooker
floozie vs. hooker
fiddler vs. tinkerer
fiddler vs. twiddler
fiddler vs. violinist
fusspot vs. worrier
fortune vs. luck
frost vs. icing
frost vs. hoar
frost vs. ice
foehn vs. fohn
fume vs. smoke
fume vs. reek
fume vs. fumigate
floret vs. floweret
frangipani vs. frangipanni
fringepod vs. lacepod
fumewort vs. fumitory
fumeroot vs. fumitory
fumeroot vs. fumewort
fleabane vs. horseweed
fireweed vs. wickup
federita vs. feterita
farkleberry vs. sparkleberry
foxberry vs. lingonberry
furze vs. whin
fleawort vs. psyllium
firethorn vs. pyracanth
feoff vs. fief
freebee vs. freebie
fee vs. tip
finances vs. funds
fourpence vs. groat
farrow vs. farrowing
feminisation vs. feminization
falloff vs. slack
fermentation vs. zymosis
fermenting vs. zymosis
ferment vs. zymosis
ferment vs. turn
ferment vs. work
fill vs. meet
fill vs. satiate
fill vs. take
fill vs. occupy
frequence vs. frequency
frequency vs. oftenness