The Broad Scots Dictionary

Faddom't - "fathomed"
Fae - "a foe"
Faiket - "unknown"
Fairin' - "a fairing, a present"
Fallow - "fellow"
Fand - "did find"
Farl - "a cake of oaten bread, etc."
Fa's - "does fall, waterfalls"
Fash - "trouble, care, to trouble, to care for"
Fashious - "troublesome"
Fasht - "troubled"
Fasteren-e'en - "fasten's even"
Faught - "fight"
Fauld - "a fold, to fold"
Faulding - "folding"
Faut - "fault"
Faute - "want, lack"
Feal - "a field, smooth"
Fearfu' - "frightful"
Feart - "frighted"
Feat - "neat, spruce"
Fechtin' - "fighting"
Feck - "many, plenty"
Fecket - "an under-waistcoat with sleeves"
Feckfu' - "large, brawny, stout"
Feckless - "puny, weak, silly"
Feckly - "weakly"
Feg - "a fig"
Feide - "feud, enmity"
Feirrie - "stout, vigorous, healthy"
Fell - "keen, biting, the flesh immediately under the skin, a field pretty level, on the side or top of a hill"
Felly - "relentless"
Fen - "successful struggle, fight"
Fend - "to live comfortably"
Fetch - "to pull by fits"
Fetch't - "pulled intermittently"
Fidge - "to fidget"
Fiel - "soft, smooth"
Fient - "fiend, a petty oath"
Fier - "sound, healthy, a brother, a friend"
Fissle - "to make a rustling noise, to fidget, a bustle"
Fit - "a foot"
Fizz - "to make a hissing noise, like fermentation"
Flainen - "flannel"
Fleech - "to supplicate in a flattering manner"
Fleech'd - "supplicated"
Fleechin - "supplicating"
Fleg - "a kick, a random stroke"
Flether - "to decoy by fair words"
Fletherin - "flethers, flattering"
Flinders - "shreds, broken pieces, splinters"
Flinging-tree - "a piece of timber hung by way of partition between two horses in a stable, a flail"
Flitter - "to vibrate like the wings of small birds"
Flittering - "fluttering, vibrating"
Flyte - "scold"
Fodgel - "squat and plump"
Foord - "a ford"
Forbye - "besides"
Forfairn - "distressed, worn out, jaded"
Forfoughten - "fatigued"
Forgather - "to meet, to encounter with"
Forgie - "to forgive"
Fother - "fodder"
Foughten - "troubled, harassed"
Fouth - "plenty, enough or more than enough"
Fow - "a bushel, etc. also a pitchfork"
Frae - "from, off"
Frammit - "strange, estranged from, at enmity with"
Frien' - "friend"
Fu' - "full"
Fud - "the scut or tail of the hare, cony, etc."
Funnie - "full of merriment"
Fur - "a furrow"
Fur-ahin - "the hindmost horse on the right hand when ploughing"
Furder - "farther"
Furm - "a form, bench"
Fyke - "trifling cares, to peddle, to be in a fuss about trifles"