4 letters
- oops7
- oots4
- opus8
- orcs7
- ouch10
- ouds6
- ours5
- oust5
- outs5
- ouzo14
- owls8
- owns8
- plus9
- poco10
- polo8
- pols8
- pons8
- pool8
- poon8
- puls9
- puns9
- rocs7
- runs6
- saul6
- scan8
- scop10
- scot7
- scow10
- scud9
- scum11
- scup11
- scut8
- shoo6
- shul8
- shun8
- silo5
- slob8
- sloe5
- slog7
- slop8
- slot5
- slow8
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- snob8
- snog7
- snot5
- snow8
- snub9
- snug8
- sock11
- soil5
- sola5
- sold6
- sole5
- soli5
- solo5
- sols5
- sone5
- song7
- sons5
- sook8
- soon5
- soot4
- sorn5
- souk9
- soul6
- soup8
- sour5
- sous5
- sown8
- spun9
- stun6
- such10
- suck12
- sulk10
- sulu7
- sumo8
- sung8
- sunk10
- sunn7
- suns6
- sync10
- tolu6
- tons5
- tool5
- toon5
- tuns6
- udos6
- ulan7
- ulna7
- ulus7
- unci9
- unco9
- undo7
- unto6
- upon9
- urns6
- wons8
- wool8
- woos7
- zoon14
- zoos13