4 letters
- open8
- opes7
- opts7
- opus8
- orbs7
- orcs7
- ores4
- orle5
- orts4
- osar4
- oses4
- ouch10
- ouds6
- ouph10
- ours5
- oust5
- outs5
- oven9
- over8
- ovum12
- owes7
- owns8
- owse7
- oxen12
- oxes11
- oyer6
- oyes6
- pehs9
- pens8
- pent8
- peon8
- pert7
- peso7
- pest7
- pets7
- phon10
- phot9
- phut10
- poet7
- pone8
- pons8
- pore7
- porn8
- port7
- pose7
- posh9
- post7
- pots7
- pour8
- pout8
- pros7
- puns9
- punt9
- pure8
- purs8
- push10
- puts8
- rant5
- rase4
- rash6
- rate4
- rath6
- rato4
- rats4
- rave8
- rebs7
- recs7
- redo5
- reds5
- rees4
- refs7
- reft7
- regs6
- rein5
- reis4
- rems7
- rend6
- rent5
- repo7
- reps7
- resh6
- rest4
- rete4
- rets4
- revs8
- rhea6
- rhos6
- rhus7
- rins5
- riot4
- rise4
- rite4
- rive8
- roan5
- robe7
- robs7
- rocs7
- rode5
- rods5
- roes4
- role5
- roms7
- root4
- rope7
- rose4
- rosy6
- rota4
- rote4
- roti4
- rotl5
- roto4
- rots4
- roue5
- roup8
- rout5
- roux12
- rove8
- rows7
- rube8
- rubs8
- rude6
- rued6
- ruer5
- rues5
- rugs7
- ruin6
- rule6
- rums8
- rune6
- rung8
- runs6
- runt6
- ruse5
- rush7
- rusk9
- rust5
- ruth7
- ruts5
- ryes6
- ryot6
- sane5
- sate4
- save8
- scot7
- scut8
- sear4
- seat4
- sect7
- seen5
- seer4
- sego6
- send6
- sene5
- sent5
- sept7
- sera4
- sere4
- serf7
- sers4
- seta4
- sets4
- sett4
- sewn8
- sext11
- shat6
- shea6
- shed7
- shes6
- shew9
- shin7
- shit6
- shiv10
- shmo9
- shod7
- shoe6
- shog8
- shoo6
- shop9
- shot6
- show9
- shri6
- shul8
- shun8
- shut7
- sine5
- sinh7
- sire4
- site4
- sith6
- sloe5
- slot5
- slue6
- slur6
- slut6
- smut8
- sned6
- snit5
- snob8
- snog7
- snot5