4 letters
- flic11
- floc11
- flub12
- flus9
- fobs10
- foci10
- foes7
- fogs9
- foil8
- foin8
- fons8
- fops10
- fora7
- forb10
- ford8
- fore7
- fork11
- form10
- fort7
- foss7
- foul9
- four8
- foys9
- frig9
- frit7
- friz16
- froe7
- frog9
- from10
- frow10
- frug10
- fubs11
- fuci11
- fuck15
- fuds9
- fugs10
- fugu11
- fuji17
- funs9
- furl9
- furs8
- fury10
- fuse8
- fuss8
- gibs9
- giro6
- gobs9
- grub10
- guru8
- hobs9
- hour7
- hubs10
- huic10
- ibis7
- ices7
- ichs9
- icon8
- info8
- inro5
- ions5
- ires4
- iris4
- irks8
- iron5
- isba7
- jibs16
- jobs16
- kifs11
- kirs8
- kobs11
- kois8
- kors8
- kris8
- kuru10
- libs8
- lobs8
- loci8
- lour6
- mibs10
- mirs7
- miso7
- mobs10
- mocs10
- mors7
- nibs8
- nobs8
- noir5
- nori5
- nous6
- nubs9
- oafs7
- oars4
- obes7
- obia7
- obis7
- obit7
- ocas7
- odic8
- offs10
- oils5
- onus6
- opus8
- orbs7
- orby9
- orca7
- orcs7
- ores4
- orts4
- osar4
- otic7
- ouch10
- ouds6
- ours5
- oust5
- outs5
- pfui11
- pics10
- piso7
- pois7
- pouf11
- pour8
- prof10
- pros7
- pubs11
- puri8
- purs8
- rebs7
- recs7
- refs7
- reif7
- reis4
- rhos6
- rhus7
- rias4
- ribs7
- rice7
- rich9
- rick11
- rids5
- rife7
- riff10
- rifs7
- rift7
- rigs6
- rims7
- rins5
- riot4
- rips7
- rise4
- risk8
- robe7
- robs7
- rock11
- rocs7
- rods5
- roes4
- roil5
- rolf8
- roms7
- roof7
- rose4
- rosy6
- roti4
- rots4
- roue5
- roup8
- rout5
- roux12
- rows7
- rube8
- rubs8
- ruby10
- ruck12
- rues5
- ruff11
- rugs7
- ruin6
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- sari4
- scab10
- scar7
- scop10
- scot7
- scow10
- scry9
- scud9
- scum11
- scup11
- scut8
- seif7
- serf7
- shri6
- sibb10
- sibs7