4 letters
- ruck12
- rues5
- rugs7
- ruin6
- rule6
- ruly8
- rums8
- rune6
- rung8
- runs6
- runt6
- ruse5
- rush7
- rusk9
- rust5
- ruth7
- ruts5
- sail5
- sain5
- salt5
- sari4
- sati4
- saul6
- scan8
- scar7
- scat7
- scot7
- scry9
- scud9
- scum11
- scup11
- scut8
- sect7
- sent5
- sett4
- shin7
- shit6
- shiv10
- shri6
- shul8
- shun8
- shut7
- sial5
- sice7
- sick11
- sics7
- sift7
- sign7
- sild6
- silk9
- sill6
- silo5
- silt5
- sine5
- sing7
- sinh7
- sink9
- sins5
- sire4
- sirs4
- site4
- sith6
- sits4
- skin9
- skit8
- slat5
- slid6
- slim8
- slip8
- slit5
- slot5
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- smit7
- smut8
- snib8
- snip8
- snit5
- snot5
- snub9
- snug8
- soil5
- soli5
- sori4
- sorn5
- sort4
- soul6
- sour5
- spic10
- spin8
- spit7
- spiv11
- spun9
- spur8
- sris4
- star4
- stat4
- stet4
- stir4
- stub8
- stud6
- stum8
- stun6
- such10
- suck12
- suer5
- suet5
- suit5
- sulk10
- sulu7
- sung8
- sunk10
- sunn7
- suns6
- sura5
- surd6
- sure5
- surf8
- syli7
- sync10
- tact7
- tail5
- tain5
- talc8
- tali5
- tans5
- tarn5
- tars4
- tart4
- tats4
- taus5
- taut5
- tavs8
- tels5
- tens5
- tent5
- tern5
- test4
- tets4
- thin7
- thir6
- this6
- thru7
- thus7
- tick11
- tics7
- tier4
- ties4
- tiki8
- tile5
- till6
- tils5
- tilt5
- tine5
- ting7
- tins5
- tint5
- tiny7
- tipi7
- tips7
- tire4
- tirl5
- tiro4
- titi4
- tits4
- tivy10
- toil5
- toit4
- tolu6
- tons5
- torc7
- tori4
- torn5
- tors4
- tort4
- tost4
- tots4
- tour5
- tout5
- tret4
- trig6
- trim7
- trio4
- trip7
- trot4
- true5
- trug7
- tsar4
- tubs8
- tuck12
- tuft8
- tugs7
- tuis5
- tule6
- tuna6
- tune6