4 letters
- fang10
- fano8
- fans8
- faro7
- fart7
- fash9
- fast7
- fate7
- fats7
- faun9
- faux15
- fawn11
- fays9
- feat7
- fens8
- feta7
- fets7
- feus8
- fiat7
- fibs10
- fino8
- fins8
- fist7
- fits7
- flab11
- flan9
- flat8
- flub12
- flus9
- foal8
- foam10
- fobs10
- foes7
- fogs9
- fohn10
- foin8
- fond9
- fons8
- font8
- foot7
- fops10
- fora7
- forb10
- fort7
- foss7
- foul9
- four8
- foys9
- frat7
- fubs11
- fuds9
- fugs10
- fund10
- funk13
- funs9
- furs8
- fuse8
- fuss8
- futz17
- gabs9
- gaff12
- gast6
- gats6
- gaun8
- gnat7
- gnus8
- goas6
- goat6
- gobs9
- gout7
- guan8
- guff13
- guns8
- gust7
- guts7
- habu10
- haft9
- hant7
- hast6
- hats6
- haut7
- hobs9
- hons7
- host6
- hots6
- hubs10
- huff13
- huns8
- hunt8
- huts7
- info8
- into5
- ions5
- iota4
- isba7
- jabs16
- jato13
- jobs16
- jota13
- jots13
- juba17
- just14
- juts14
- kabs11
- kafs11
- kaon9
- kats8
- knob12
- knot9
- koan9
- koas8
- kobs11
- kuna10
- labs8
- last5
- lats5
- loaf8
- loan6
- lobs8
- loft8
- lost5
- lota5
- lots5
- lout6
- luff12
- luna7
- lunt7
- lust6
- mano8
- mans8
- mast7
- mats7
- maun9
- maut8
- moan8
- moas7
- moat7
- mobs10
- mons8
- most7
- mots7
- muff14
- muns9
- muon9
- must8
- muts8
- nabe8
- nabs8
- nags7
- naif8
- nans6
- naoi5
- naos5
- naps8
- nays7
- neat5
- nebs8
- nest5
- nets5
- nibs8
- nits5
- nobs8
- nods6
- noes5
- nogs7
- noma8
- noms8
- nona6
- nose5
- nosh7
- nosy7
- nota5
- note5
- noun7
- nous6
- nova9
- nows8
- nowt8
- nubs9
- numb12
- nuns7
- nuts6
- oafs7
- oaks8
- oars4
- oast4
- oath6
- oats4
- obes7
- obia7
- obis7
- obit7
- ocas7
- ofay9
- offs10
- okas8
- ones5
- onto5
- onus6
- oots4