in English is:

polyphony

Mutations

Soft:bolyffoni
Nasal:mholyffoni
Aspirate:pholyffoni

Use

y polyffoni hwn
fy mholyffoni i
dy bolyffoni di
ei bolyffoni ef/o
ei pholyffoni hi
ein polyffoni ni
eich polyffoni chi
eu polyffoni nhw/hwy
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