4 letters
- neif8
- nigh9
- nill7
- nils6
- nipa8
- nips8
- noil6
- noir5
- nori5
- null8
- nurd7
- nurl7
- pail8
- pain8
- pair7
- pang10
- pein8
- pelf11
- peri7
- pfui11
- pial8
- pian8
- pier7
- pigs9
- pile8
- pili8
- pill9
- pily10
- pina8
- pine8
- ping10
- pink12
- pins8
- pint8
- piny10
- pion8
- pirn8
- plan9
- plie8
- plug11
- plum12
- plus9
- pong10
- porn8
- pouf11
- pour8
- prau8
- prig9
- prim10
- prof10
- prog9
- puff14
- pugh12
- pugs10
- pula9
- pule9
- puli9
- pull10
- pulp12
- puls9
- puna9
- pung11
- punk13
- puns9
- punt9
- puny11
- pure8
- puri8
- purl9
- purr8
- purs8
- pyin10
- quin15
- quip17
- ragi6
- rail5
- rain5
- rang7
- rani5
- reif7
- rein5
- rial5
- riel5
- rife7
- riff10
- rifs7
- rift7
- rigs6
- rile5
- rill6
- rind6
- ring7
- rink9
- rins5
- ripe7
- rips7
- roil5
- rolf8
- roup8
- ruff11
- ruga7
- rugs7
- ruin6
- rule6
- ruly8
- rump11
- rune6
- rung8
- runs6
- runt6
- sign7
- sing7
- slip8
- slug8
- slur6
- snip8
- snug8
- spin8
- spun9
- spur8
- sung8
- surf8
- ting7
- tirl5
- trig6
- trip7
- trug7
- tung8
- turf8
- turn6
- ugly10
- ulan7
- ulna7
- unai6
- unci9
- unit6
- upon9
- urge7
- uric8
- urns6
- virl9
- wing10
- zing16