in English is:

metamorphism

Mutations

Soft:fetamorffedd
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y metamorffedd hwn
fy metamorffedd i
dy fetamorffedd di
ei fetamorffedd ef/o
ei metamorffedd hi
ein metamorffedd ni
eich metamorffedd chi
eu metamorffedd nhw/hwy
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