4 letters
- roto4
- rots4
- rout5
- ruin6
- runs6
- runt6
- rust5
- ruts5
- sacs7
- sail5
- sain5
- sals5
- salt5
- sans5
- sati4
- saul6
- scan8
- scat7
- scop10
- scot7
- scow10
- scud9
- scum11
- scup11
- scut8
- secs7
- sect7
- seif7
- seis4
- self8
- sels5
- sent5
- sets4
- shin7
- shit6
- shoo6
- shot6
- shul8
- shun8
- shut7
- sial5
- sibs7
- sice7
- sick11
- sics7
- sift7
- sign7
- sild6
- silk9
- sill6
- silo5
- silt5
- sims7
- sine5
- sing7
- sinh7
- sink9
- sins5
- sips7
- sirs4
- site4
- sith6
- sits4
- skin9
- skis8
- skit8
- slat5
- slid6
- slim8
- slip8
- slit5
- slob8
- sloe5
- slog7
- slop8
- slot5
- slow8
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- smit7
- smut8
- snib8
- snip8
- snit5
- snob8
- snog7
- snot5
- snow8
- snub9
- snug8
- sobs7
- sock11
- sods5
- sofa7
- soft7
- soil5
- sola5
- sold6
- sole5
- soli5
- solo5
- sols5
- sone5
- song7
- sons5
- sook8
- soon5
- soot4
- sops7
- sori4
- sorn5
- sort4
- soth6
- sots4
- souk9
- soul6
- soup8
- sour5
- sous5
- sown8
- sows7
- soys6
- spic10
- spin8
- spit7
- spot7
- spun9
- sris4
- stir4
- stoa4
- stob7
- stop7
- stow7
- stub8
- stud6
- stum8
- stun6
- subs8
- such10
- suck12
- suds6
- sues5
- suet5
- suit5
- sulk10
- sulu7
- sumo8
- sums8
- sung8
- sunk10
- sunn7
- suns6
- sups8
- suqs14
- surf8
- suss5
- swot7
- syli7
- sync10
- taco7
- tail5
- tain5
- talc8
- tali5
- tans5
- taos4
- tass4
- taus5
- tels5
- tens5
- thin7
- thio6
- this6
- thou7
- thus7
- tick11
- tics7
- ties4
- tiff10
- tile5
- till6
- tils5
- tilt5
- tine5
- ting7
- tins5
- tint5
- tiny7
- tips7
- tirl5
- tiro4
- tits4
- tods5
- toes4
- toff10
- toft7