4 letters
- ruin6
- rums8
- rune6
- rung8
- runs6
- runt6
- ruse5
- rush7
- rusk9
- rust5
- ruth7
- ruts5
- sain5
- saki8
- sank9
- sari4
- sark8
- sati4
- scut8
- seif7
- sent5
- serf7
- shat6
- shim9
- shin7
- ship9
- shit6
- shiv10
- shot6
- shri6
- shul8
- shun8
- shut7
- sick11
- sift7
- sigh8
- sign7
- sike8
- silk9
- silt5
- sine5
- sing7
- sinh7
- sink9
- sins5
- sire4
- sirs4
- site4
- sith6
- sits4
- skat8
- skid9
- skim11
- skin9
- skip11
- skis8
- skit8
- skua9
- slit5
- slur6
- slut6
- smit7
- smut8
- snib8
- snip8
- snit5
- snot5
- snub9
- snug8
- soft7
- sori4
- sorn5
- sort4
- soth6
- souk9
- sour5
- spik11
- spin8
- spit7
- spun9
- spur8
- sris4
- star4
- stir4
- stub8
- stud6
- stum8
- stun6
- such10
- suck12
- suer5
- suet5
- sugh9
- suit5
- sulk10
- sung8
- sunk10
- sunn7
- suns6
- sura5
- surd6
- sure5
- surf8
- tahr6
- tain5
- tank9
- tans5
- tarn5
- tars4
- task8
- taus5
- tens5
- tern5
- than7
- then7
- thin7
- thio6
- thir6
- this6
- thou7
- thro6
- thru7
- thud8
- thug9
- thus7
- tick11
- tics7
- tier4
- ties4
- tiff10
- tike8
- tiki8
- tils5
- tine5
- ting7
- tins5
- tint5
- tiny7
- tips7
- tire4
- tirl5
- tiro4
- tits4
- tofu8
- tons5
- tori4
- torn5
- tors4
- tosh6
- tour5
- tref7
- trek8
- trig6
- trim7
- trio4
- trip7
- true5
- trug7
- tsar4
- tsks8
- tubs8
- tuck12
- tufa8
- tuff11
- tuft8
- tugs7
- tuis5
- tuna6
- tune6
- tung8
- tuns6
- tups8
- turd6
- turf8
- turk9
- turn6
- tush7
- tusk9
- tuts5
- twin8
- tyin7
- ughs9
- ukes9
- unai6
- unci9
- unit6
- unto6
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- utas5
- whin10
- whir9
- whit9
- wink12
- wins8