4 letters
- fink12
- fino8
- fins8
- fire7
- firm10
- firn8
- firs7
- fisc10
- fish9
- fist7
- fits7
- flak12
- flan9
- flic11
- foci10
- foin8
- fons8
- fora7
- fork11
- foss7
- frae7
- frag9
- frap10
- frat7
- fray9
- frig9
- frit7
- friz16
- fuci11
- fuck15
- funk13
- funs9
- furs8
- fuss8
- gain7
- gars6
- gink11
- gins7
- girn7
- gnar7
- gran7
- grin7
- hack13
- haik10
- hair6
- hank11
- hark10
- hick13
- hins7
- hisn7
- hiss6
- ices7
- ichs9
- icky13
- icon8
- ikat8
- ikon9
- ilka9
- ilks9
- inch10
- info8
- inia5
- inks9
- inky11
- inns6
- inro5
- ions5
- ires4
- iris4
- irks8
- iron5
- isba7
- isms7
- izar13
- jack20
- jars13
- jink18
- jins14
- kaas8
- kabs11
- kadi9
- kaes8
- kafs11
- kaif11
- kail9
- kain9
- kaki12
- kami11
- kana9
- kane9
- kaon9
- karn9
- kart8
- kats8
- kays10
- kbar11
- keas8
- kefs11
- keir8
- kens9
- kerf11
- kern9
- khaf13
- khan11
- khis10
- kick15
- kids9
- kief11
- kier8
- kifs11
- kiln10
- kina9
- kind10
- kine9
- king11
- kink13
- kino9
- kins9
- kips11
- kirk12
- kirn9
- kirs8
- kiss8
- kist8
- kits8
- kiva12
- knap12
- knar9
- knit9
- knur10
- koan9
- koas8
- kois8
- kors8
- koss8
- kris8
- kuna10
- kvas12
- kyar10
- lack12
- lacs8
- laic8
- lain6
- lair5
- lank10
- lari5
- lark9
- lars5
- lass5
- liar5
- lick12
- link10
- lins6
- lira5
- mack14
- macs10
- main8
- mair7
- mans8
- marc10
- mark11
- mars7
- mask11
- mass7
- mica10
- mick14
- mina8
- mink12
- mirk11
- mirs7
- miss7
- nabs8
- nags7
- naif8
- nail6
- nans6
- naoi5
- naos5
- naps8
- narc8
- nard6
- nark9
- nary7
- nays7
- nazi14
- near5
- neck12
- neif8
- ness5
- nibs8
- nice8
- nick12
- nils6
- nims8
- nipa8
- nips8
- nisi5
- nits5
- nock12
- noir5