Welsh
Noun
gwâl f (plural gwalau or gwaliau)
-  lair, covert, den
-  litter
-  couch, bed
Mutation
| Welsh mutation | 
|---|
| radical | soft | nasal | aspirate | 
| gwâl | wâl | ngwâl | unchanged | 
| Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.
 | 
References