foot vs. pick
flyover vs. overpass
flow vs. stream
flow vs. menstruation
flow vs. menstruate
flow vs. run
flicker vs. flutter
flutter vs. waver
flap vs. flutter
flapping vs. flutter
flutter vs. fluttering
flutter vs. kerfuffle
flutter vs. quiver
flitter vs. flutter
flutter vs. palpitate
flicker vs. glint
flicker vs. spark
flick vs. flicker
feather vs. feathering
feather vs. plume
feather vs. plumage
feather vs. fledge
feather vs. square
flood vs. overflow
flood vs. outpouring
flood vs. flowage
flood vs. floodlight
flood vs. photoflood
flood vs. inundation
flood vs. torrent
flood vs. swamp
flood vs. inundate
flood vs. glut
flood vs. oversupply
focalisation vs. focalization
focalization vs. focusing
fluoridation vs. fluoridization
fluoridation vs. fluoridisation
filling vs. pick
fill vs. filling
fusion vs. unification
fusion vs. merger
fork vs. ramification
fork vs. separate
fork vs. ramify
fork vs. furcate
fork vs. pitchfork
forking vs. ramification
forking vs. furcation
flexion vs. flexure
flexion vs. inflection
flection vs. flexion
flexure vs. fold
flexure vs. plication
flex vs. twist
fold vs. folding
fold vs. sheepfold
fold vs. sheepcote
fold vs. plica
flock vs. fold
fashion vs. style
fashion vs. way
fashion vs. manner
fashion vs. mode
fashion vs. forge
fun vs. playfulness
fun vs. play
fun vs. merriment
fun vs. hell
fun vs. sin
firefighter vs. fireman
fireman vs. reliever
fireman vs. stoker
farming vs. land
farming vs. husbandry
fistfight vs. fisticuffs
fisticuffs vs. slugfest
fight vs. fighting
fight vs. scrap
fight vs. struggle
fight vs. oppose
fight vs. press
fishing vs. sportfishing
frame vs. framing
frame vs. skeleton
frame vs. underframe
frame vs. shape
frame vs. inning
fantan vs. parliament
festival vs. fete
feast vs. fete
fete vs. fiesta
frolic vs. play
frolic vs. lark
flirt vs. flirting
flirt vs. flirtation
flirt vs. toying
flirt vs. tease
flirt vs. romance
flirt vs. mash
flirt vs. philander
flirt vs. play
folly vs. indulgence
folly vs. stupidity
folly vs. foolishness
folly vs. imbecility
folly vs. unwiseness
folly vs. madness
foolery vs. indulgence
frivolity vs. prank
frivolity vs. frivolousness
figure vs. pattern
figure vs. number
figure vs. shape
fig vs. figure
figure vs. image
figure vs. trope
figure vs. name
figure vs. reckon
figure vs. forecast
figure vs. project
figure vs. picture
figure vs. see
figure vs. visualize
figure vs. visualise
furor vs. furore
fad vs. furor
furor vs. rage
flurry vs. stir
fuss vs. mother
fuss vs. overprotect
fuss vs. stir
fuss vs. spat
fuss vs. tiff
fuss vs. squabble
fuss vs. pettifoggery
fuss vs. trouble
fuss vs. hassle
flap vs. fuss
fuss vs. pother
fuss vs. tizzy
fret vs. fuss
fuss vs. niggle
facility vs. installation
facility vs. readiness
facility vs. quickness
fatherhood vs. paternity
furnishing vs. trappings
foliage vs. foliation
foliation vs. leafing
friction vs. rubbing
fatigue vs. weariness
fatigue vs. tiredness
fatigue vs. jade
fatigue vs. weary
fatigue vs. wear
fag vs. fatigue
fatigue vs. tire
fatigue vs. outwear
fatigue vs. pall
familiarity vs. impropriety
familiarity vs. indecorum
familiarity vs. liberty
familiarity vs. intimacy
fetichism vs. fetishism
fullback vs. halfback
function vs. part
function vs. office
function vs. role
function vs. use
function vs. procedure
function vs. occasion
function vs. mapping
function vs. map
function vs. officiate
function vs. run
function vs. serve
feigning vs. pretense
falsehood vs. falsity
falsehood vs. untruth
fabrication vs. lying
fabrication vs. manufacture
fabrication vs. manufacturing
fabrication vs. fictionalization
fabrication vs. fictionalisation
fabrication vs. fiction
fable vs. fabrication
fibbing vs. paltering
fraud vs. sham
fraud vs. pseudo
fraud vs. imposter
fraud vs. impostor
faker vs. fraud
fraud vs. shammer
fraud vs. pseud
fraud vs. pretender
flimflam vs. hustle
foray vs. raid