in English is:

catastrophism

Mutations

Soft:gatastroffiaeth
Nasal:nghatastroffiaeth
Aspirate:chatastroffiaeth

Use

y gatastroffiaeth hon
fy nghatastroffiaeth i
dy gatastroffiaeth di
ei gatastroffiaeth ef/o
ei chatastroffiaeth hi
ein catastroffiaeth ni
eich catastroffiaeth chi
eu catastroffiaeth nhw/hwy
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