4 letters
- scan8
- scar7
- scat7
- scud9
- scum11
- scup11
- scut8
- shin7
- shun8
- sial5
- sice7
- sick11
- sics7
- sign7
- sima7
- sine5
- sing7
- sinh7
- sink9
- sins5
- skin9
- skua9
- snag7
- snap8
- snaw8
- snib8
- snip8
- snit5
- snub9
- snug8
- span8
- spic10
- spin8
- spun9
- stun6
- suba8
- such10
- suck12
- suit5
- sung8
- sunk10
- sunn7
- suns6
- sura5
- swan8
- sync10
- tain5
- tans5
- taus5
- tics7
- tins5
- tuis5
- tuna6
- tuns6
- ulan7
- ulna7
- unai6
- unau7
- unci9
- unco9
- unit6
- upas8
- uric8
- urns6
- ursa5
- utas5
- vacs11
- vain9
- vans9
- vaus9
- vina9
- visa8
- wain8
- wans8
- wins8
- yins7
- yuan8
- yuca10
- zinc17
- zins14