in English is:

verbalism

Mutations

Soft:eiriolaeth
Nasal:ngeiriolaeth
Aspirate:(no mutation)

Use

yr eiriolaeth hon
fy ngeiriolaeth i
dy eiriolaeth di
ei eiriolaeth ef/o
ei geiriolaeth hi
ein geiriolaeth ni
eich geiriolaeth chi
eu geiriolaeth nhw/hwy
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