5 letters
- serac8
- serai5
- serin6
- sieur6
- since9
- singe8
- siren6
- sirup9
- snare6
- sneap9
- snipe9
- space11
- spang11
- spare8
- spean9
- spear8
- speir8
- spica11
- spice11
- spier8
- spine9
- spire8
- sprag10
- sprig10
- sprue9
- sprug11
- spurn10
- sucre9
- sugar8
- suing9
- super9
- supra9
- surge8
- unais7
- uncap13
- uncia10
- unpeg12
- unrig9
- unrip10
- uraei6
- urase6
- ureas6
- ureic9
- urges8
- urine7
- ursae6
- usage8
- using9
- usnea7