fourfold vs. quadruplex
fourth vs. fourthly
fourth vs. quaternary
fourth vs. quarter
fractiously vs. peevishly
fractiously vs. querulously
frenziedly vs. hectically
frigidly vs. frostily
fervently vs. fierily
fervidly vs. fierily
flamboyantly vs. showily
flamboyantly vs. flashily
flashily vs. meretriciously
fain vs. willingly
fain vs. prepared
fain vs. inclined
forte vs. specialty
forte vs. loudly
forte vs. loud
free vs. loose
free vs. innocent
free vs. spare
free vs. gratuitous
free vs. gratis
free vs. release
free vs. unblock
free vs. unfreeze
free vs. justify
free vs. liberate
free vs. rid
free vs. relieve
feasibly vs. practicably
fishily vs. queerly
funnily vs. oddly
fulsomely vs. unctuously
frantically vs. madly
faulty vs. wrong
feathered vs. feathery
feathery vs. plumy
featherlike vs. feathery
frilled vs. frilly
frilled vs. ruffled
fringed vs. laciniate
floating vs. vagabond
floating vs. natation
fearful vs. timorous
fearful vs. trepid
fearful vs. frightful
frightened vs. scared
frightened vs. panicky
frightened vs. panicked
frightened vs. terrified
forced vs. strained
fly vs. vaporize
fly vs. vaporise
fly vs. vanish
fly vs. wing
fly vs. pilot
fell vs. fly
flee vs. fly
feverish vs. hectic
feverish vs. feverous
febrile vs. feverish
frantic vs. frenetic
frantic vs. phrenetic
frantic vs. frenzied
frenzied vs. manic
fearless vs. unafraid
furious vs. wild
fierce vs. furious
furious vs. savage
ferocious vs. furious
facade vs. frontal
frontage vs. frontal
frontal vs. frontlet
following vs. undermentioned
following vs. next
following vs. pursuit
followers vs. following
fluent vs. smooth
fluent vs. fluid
fluent vs. liquid
forgetful vs. oblivious
forgetful vs. mindless
forgetful vs. unmindful
forgetful vs. short
freestanding vs. separate
fascinating vs. gripping
fascinating vs. riveting
fetching vs. taking
fetching vs. winning
frightening vs. terrorization
forbidding vs. ominous
forbidding vs. grim
forbiddance vs. forbidding
fortunate vs. rosy
fortunate vs. golden
favorable vs. golden
favorable vs. favourable
favorable vs. friendly
favourable vs. golden
forthcoming vs. upcoming
forthcoming vs. outgoing
foliate vs. foliated
foliaceous vs. foliate
foliate vs. page
foliate vs. paginate
formidable vs. redoubtable
formidable vs. unnerving
foliaceous vs. foliose
foliaceous vs. foliaged
ferned vs. ferny
fernlike vs. ferny
furred vs. furry
fuzzed vs. fuzzy
foggy vs. fuzzy
fuzzy vs. muzzy
fuzzy vs. hazy
fitter vs. healthier
flyblown vs. sordid
flyblown vs. maggoty
flaxen vs. sandy
fettered vs. shackled
furled vs. rolled
faint vs. timid
faint vs. shadowy
faint vs. vague
faint vs. wispy
faint vs. weak
faint vs. feeble
faint vs. light
faint vs. syncope
faint vs. swoon
fastened vs. tied
filthy vs. foul
foul vs. nasty
foul vs. smutty
foul vs. unsporting
foul vs. unsportsmanlike
foul vs. funky
fetid vs. foul
foetid vs. foul
foul vs. noisome
foul vs. smelly
foul vs. stinking
foul vs. repellent
foul vs. maculate
foul vs. pollute
foolhardy vs. heady
foolhardy vs. rash
foolhardy vs. reckless
floodlighted vs. floodlit
fainthearted vs. timid
faineant vs. indolent
fitful vs. interrupted
fitful vs. spasmodic
fierce vs. rough
fierce vs. violent
foreordained vs. predestinate
foreordained vs. predestined
fringy vs. marginal
fatal vs. fateful
fateful vs. portentous
fateful vs. foreboding
final vs. last
focused vs. focussed
fickle vs. volatile
fluid vs. uncertain
fluid vs. mobile
fluid vs. liquid
fluid vs. runny
fixed vs. frozen
fixed vs. rigid
fixed vs. set
frozen vs. icy
frigid vs. frozen
frozen vs. glacial
frosty vs. frozen
fuscous vs. taupe
flushed vs. rosy
faded vs. weakened
flashy vs. sporty
flashy vs. loud
fatheaded vs. thick
fogged vs. foggy
foggy vs. hazy
foggy vs. misty
foggy vs. groggy
foggy vs. logy
foggy vs. stuporous
familiar vs. intimate
familiar vs. fellow
foldable vs. foldaway
foldable vs. folding
flammable vs. inflammable
frequent vs. haunt
frequent vs. shop
fragmental vs. fragmentary