4 letters
- nibs8
- nide6
- nidi6
- nigh9
- nill7
- nils6
- nisi5
- nodi6
- noil6
- nubs9
- nude7
- null8
- numb12
- nurd7
- nurl7
- pili8
- ping10
- plug11
- puli9
- pung11
- quid15
- quin15
- rind6
- ring7
- ruin6
- rung8
- sign7
- sild6
- sing7
- slid6
- slub9
- slug8
- snib8
- snub9
- snug8
- sung8
- ting7
- tung8
- ugly10
- ulan7
- ulna7
- unai6
- unbe9
- unci9
- unde7
- undo7
- undy9
- unit6
- wild9
- wind9
- wing10
- zing16