foray vs. strip
federalisation vs. federalization
freeze vs. halt
freeze vs. frost
freeze vs. freezing
freeze vs. suspend
fart vs. wind
farting vs. wind
flatus vs. wind
facing vs. lining
fellatio vs. fellation
fuck vs. shag
fuck vs. screw
fuck vs. love
fuck vs. know
fuck vs. jazz
fuck vs. hump
flinch vs. wince
feel vs. finger
feel vs. palpate
feel vs. sense
fetoscopy vs. foetoscopy
forage vs. foraging
forage vs. grass
forage vs. pasture
forage vs. pasturage
forage vs. scrounge
frisk vs. frisking
frisk vs. lark
fictionalisation vs. fictionalization
formulation vs. preparation
fervor vs. fire
fervour vs. fire
fervency vs. fire
fervidness vs. fire
fire vs. flame
fire vs. raise
fire vs. fuel
formalisation vs. formalization
fetometry vs. foetometry
fueling vs. refueling
forestalling vs. obviation
forbearance vs. patience
fraternisation vs. fraternization
filibuster vs. filibusterer
falter vs. waver
falter vs. stammer
falter vs. stutter
falter vs. stumble
freight vs. freightage
freight vs. shipment
ferry vs. ferrying
ferry vs. ferryboat
financing vs. funding
funding vs. support
floatation vs. flotation
field vs. plain
field vs. sphere
field vs. orbit
field vs. study
field vs. theater
field vs. theatre
fosterage vs. fostering
fence vs. fencing
fatism vs. fattism
flogging vs. tanning
flagellation vs. tanning
fray vs. rub
fray vs. frazzle
formality vs. formalness
formalities vs. formality
faith vs. trust
faith vs. religion
fetich vs. fetish
fetish vs. hoodoo
fetish vs. juju
fetish vs. voodoo
fetish vs. vodoun
favor vs. favour
favor vs. prefer
favor vs. privilege
forgiveness vs. pardon
feeder vs. tributary
foram vs. foraminifer
flagellum vs. scourge
fetus vs. foetus
fledgeling vs. starter
firebird vs. hangbird
firebird vs. redbird
fieldfare vs. snowbird
frog vs. toad
frog vs. salientian
fur vs. pelt
fleece vs. wool
fleece vs. sheepskin
fleece vs. shear
fleece vs. pluck
forelock vs. foretop
flatworm vs. platyhelminth
fluke vs. trematode
flue vs. fluke
filaree vs. filaria
feist vs. fice
fox vs. slyboots
fox vs. throw
fox vs. trick
fossa vs. pit
flag vs. flagstone
flag vs. pin
flag vs. masthead
flag vs. iris
flag vs. swag
flag vs. sag
firebug vs. incendiary
fawn vs. truckle
fawn vs. kowtow
fawn vs. kotow
fisher vs. pekan
fisher vs. fisherman
fitch vs. polecat
foulmart vs. polecat
foumart vs. polecat
flank vs. wing
fin vs. flipper
fin vs. louver
fin vs. louvre
fin vs. tailfin
float vs. swim
flounder vs. stagger
flack vs. flak
fallal vs. gaud
freighter vs. merchantman
fender vs. wing
fag vs. queen
facia vs. fascia
faggot vs. fagot
faggot vs. queen
faggoting vs. fagoting
freeway vs. pike
fan vs. rooter
fan vs. winnow
fabric vs. textile
fabric vs. framework
face vs. grimace
face vs. side
face vs. present
face vs. front
facsimile vs. fax
facsimile vs. telefax
factory vs. mill
fagot vs. queen
fedora vs. homburg
Stetson vs. fedora
fedora vs. trilby
fishery vs. piscary
felloe vs. felly
felt vs. mat
firearm vs. piece
fence vs. palisade
fence vs. wall
fence vs. surround
figurehead vs. front
figurehead vs. strawman
figurine vs. statuette
filament vs. filum
filament vs. strand
fanlight vs. skylight
fanlight vs. transom
fanjet vs. turbojet
fanjet vs. turbofan
file vs. register
fess vs. fesse
filet vs. fillet
festoon vs. festoonery
farm vs. grow
farm vs. raise
fireplace vs. hearth
fetoscope vs. foetoscope
filler vs. makeweight
fetter vs. hobble
fetter vs. shackle
fireplug vs. plug
fez vs. tarboosh
fillet vs. stopping
fillet vs. taenia
fillet vs. lemniscus
fiber vs. fibre
fiber vs. roughage
firebreak vs. fireguard
farmplace vs. farmstead
film vs. picture
film vs. pic
film vs. movie
film vs. flick
film vs. shoot
fiberboard vs. fibreboard
filter vs. percolate
filter vs. permeate