4 letters
- rung8
- runs6
- runt6
- ruse5
- scup11
- sice7
- sign7
- sine5
- sing7
- sipe7
- sire4
- snip8
- snug8
- spec10
- spic10
- spin8
- spue8
- spun9
- spur8
- suer5
- sung8
- supe8
- sure5
- tern5
- tier4
- tine5
- ting7
- tire4
- trig6
- trip7
- true5
- trug7
- tune6
- tung8
- turn6
- unai6
- unbe9
- unci9
- unco9
- unde7
- unit6
- upon9
- urea5
- urge7
- uric8
- urns6
- user5
- vein9
- vice11
- vier8
- vine9
- weir7
- wine8
- wing10
- wipe10
- wire7
- wren8
- yipe9
- yirr6
- zein14
- zinc17
- zing16