rwyfau

Welsh

(North Wales, standard) IPA^(key): /ˈrʊɨ̯vaɨ/
- (North Wales, colloquial) IPA^(key): /ˈrʊɨ̯vɛ/, /ˈrʊɨ̯va/
(South Wales, standard) IPA^(key): /rʊi̯vai̯/
- (South Wales, colloquial) IPA^(key): /rʊi̯vɛ/

rwyfau

Welsh mutation
radical	soft	nasal	aspirate
rhwyfau	rwyfau	unchanged	unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.