4 letters
- reek8
- reel5
- rees4
- refs7
- reft7
- regs6
- reif7
- rein5
- reis4
- rems7
- rend6
- rent5
- reps7
- resh6
- rest4
- rete4
- rets4
- revs8
- rhea6
- rhos6
- rhus7
- rife7
- rifs7
- rins5
- rise4
- roes4
- rose4
- ruer5
- rues5
- rune6
- runs6
- ruse5
- rush7
- ryes6
- safe7
- sane5
- sans5
- sash6
- sear4
- seas4
- secs7
- seed5
- seek8
- seel5
- seem7
- seen5
- seep7
- seer4
- sees4
- segs6
- seif7
- seis4
- self8
- sels5
- seme7
- send6
- sene5
- sent5
- sera4
- sere4
- serf7
- sers4
- sets4
- sewn8
- sews7
- shea6
- shed7
- shes6
- shew9
- shin7
- shoe6
- shri6
- shun8
- sine5
- sinh7
- sins5
- sire4
- sirs4
- skee8
- sned6
- snye7
- sone5
- sons5
- sore4
- sorn5
- sris4
- suer5
- sues5
- suns6
- sure5
- surf8
- syne7
- teen5
- tees4
- tens5
- tern5
- thee6
- then7
- tree4
- tref7
- urns6
- user5
- uses5
- veer8
- vees8
- ween8
- weer7
- wees7
- wens8
- were7
- whee9
- when10
- wren8
- yens7
- zees13