4 letters
- fico10
- fido8
- fids8
- fief10
- fife10
- figs9
- file8
- filo8
- fils8
- fine8
- fino8
- fins8
- fire7
- firm10
- firn8
- firs7
- fisc10
- fish9
- fist7
- fits7
- five11
- floe8
- flub12
- flue9
- flus9
- fobs10
- foci10
- foes7
- fogs9
- foil8
- foin8
- fons8
- fops10
- fora7
- forb10
- ford8
- fore7
- fork11
- form10
- fort7
- foss7
- foul9
- four8
- foys9
- frae7
- free7
- fret7
- frig9
- frit7
- friz16
- froe7
- frog9
- from10
- frow10
- frug10
- fubs11
- fuci11
- fuds9
- fuel9
- fugs10
- fuji17
- fume11
- funs9
- furl9
- furs8
- fury10
- fuse8
- fuss8
- fuze17
- gibe9
- gibs9
- gies6
- giro6
- gobs9
- goer6
- goes6
- gore6
- grub10
- grue7
- heir6
- herb9
- hero6
- hers6
- hies6
- hire6
- hobs9
- hoer6
- hoes6
- hose6
- hour7
- hubs10
- hues7
- ibex14
- ibis7
- ices7
- ides5
- info8
- inro5
- ions5
- ired5
- ires4
- iris4
- irks8
- iron5
- isba7
- isle5
- jibe16
- jibs16
- jobs16
- joes13
- jube17
- kefs11
- keir8
- kerb11
- kerf11
- kibe11
- kief11
- kier8
- kifs11
- kirs8
- kobs11
- kois8
- kore8
- kors8
- kris8
- kues9
- leis5
- libs8
- lief8
- lier5
- lies5
- lieu6
- life8
- lire5
- lobe8
- lobs8
- lore5
- lose5
- lour6
- lube9
- lues6
- lure6
- meou8
- mibs10
- mire7
- mirs7
- mise7
- miso7
- mobs10
- more7
- mors7
- moue8
- mure8
- muse8
- nebs8
- neif8
- nibs8
- nobs8
- noes5
- noir5
- nori5
- nose5
- nous6
- nubs9
- oafs7
- oars4
- obes7
- obey9
- obia7
- obis7
- obit7
- oboe7
- odes5
- offs10
- ogre6
- oils5
- okes8
- oles5
- omer7
- ones5
- onus6
- opes7
- opus8
- orbs7
- orby9
- orcs7
- ores4
- orle5
- orts4
- osar4
- oses4
- ouds6
- ours5
- oust5
- outs5
- over8
- owes7
- owse7
- oxes11
- oyer6