4 letters
- filo8
- fils8
- find9
- fine8
- fink12
- fino8
- fins8
- fire7
- firn8
- firs7
- fisc10
- fish9
- fist7
- fits7
- five11
- flab11
- flan9
- flea8
- fled9
- flee8
- flew11
- flex15
- fley10
- flic11
- flip11
- flit8
- floe8
- flub12
- flue9
- flus9
- flux16
- fobs10
- foes7
- foil8
- foin8
- fons8
- foss7
- foul9
- fubs11
- fuci11
- fuds9
- fuel9
- fugs10
- fuji17
- full10
- fume11
- fund10
- funk13
- funs9
- furl9
- furs8
- fuse8
- fuss8
- fuze17
- gels7
- gens7
- genu8
- gibe9
- gibs9
- gien7
- gies6
- gill8
- gins7
- glen8
- glib10
- glue8
- gnus8
- gulf11
- gull9
- guls8
- guns8
- heil7
- hell8
- hens7
- hies6
- hill8
- hins7
- hisn7
- hiss6
- hubs10
- hues7
- hull9
- huns8
- ibex14
- ibis7
- ices7
- ides5
- idle6
- iglu8
- ilea5
- ilex12
- ilks9
- ills6
- illy8
- inby10
- info8
- inks9
- inly8
- inns6
- ions5
- ires4
- isba7
- isle5
- isms7
- jell15
- jess13
- jibe16
- jibs16
- jill15
- jins14
- jube17
- kefs11
- kens9
- kibe11
- kief11
- kifs11
- kill10
- kiln10
- kine9
- kins9
- kiss8
- kues9
- kune10
- labs8
- lain6
- lane6
- lase5
- lass5
- leaf8
- leal6
- lean6
- leas5
- lees5
- left8
- legs7
- leis5
- leks9
- leku10
- lend7
- leno6
- lens6
- lent6
- less5
- lest5
- lets5
- leud7
- leys7
- libs8
- lice8
- lids6
- lied6
- lief8
- lien6
- lier5
- lies5
- lieu6
- life8
- lift8
- like9
- lilt6
- lily8
- limb11
- lime8
- limn9
- line6
- ling8
- link10
- linn7
- lino6
- lins6
- lint6
- liny8
- lion6
- lipe8
- lips8
- lire5
- lisp8
- list5
- lite5
- lits5
- litu6
- live9
- lobe8
- lobs8
- loin6
- lone6
- lose5
- loss5
- lube9
- luce9
- lude7
- lues6
- luff12
- luge8
- lugs8
- lull8
- lulu8
- lums9
- luna7
- lune7