HackerVoca

, brood, school, swarm, herd, company
flood : deluge, overflow
flourish* : thrive, prosper, succeed
flow : stream, run
fluent : flowing
foe : enemy, opponent, adversary, antagonist
fog : mist, haze
follow : succeed, ensue
food : provisions
foolish : silly, fatuous /adjective
very silly or stupid: fatuous comments
fatuously adverb
fatuousness noun [uncountable] , stupid, dull
forbid : inhibit, prohibit
force : strength, power, might, energy
forecast : predict, foretell, foresee
foresight : forethought
formidable : dreadful, threatening, fearful, frightful
foster : rear, breed, nourish, raise, promote
foul : filthy1 / adjective filthier, filthiest

1 extremely dirty: Simon never cleans his house - it's absolutely filthy!

2 showing or describing sexual acts in a very rude or offensive way: Mitch was just telling us a filthy joke when Kia walked in.

?filthily adverb
?filthiness noun [uncountable] , dirty, stained, polluted