in English is:

alliteration

Mutations

Soft:gyflythreniad
Nasal:nghyflythreniad
Aspirate:chyflythreniad

Use

y cyflythreniad hwn
fy nghyflythreniad i
dy gyflythreniad di
ei gyflythreniad ef/o
ei chyflythreniad hi
ein cyflythreniad ni
eich cyflythreniad chi
eu cyflythreniad nhw/hwy
External

Dictionary Portal

This is a library of dictionaries and other online resources where you can search further for cyflythreniad*:

Specialist Dictionaries
Glossaries
Terminology
Encyclopedia
Example Sentences
Sentences containing:

*External websites will be opened in a new window.