in English is:

federalism

Mutations

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

Use

y ffederaliaeth hon
fy ffederaliaeth i
dy ffederaliaeth di
ei ffederaliaeth ef/o
ei ffederaliaeth hi
ein ffederaliaeth ni
eich ffederaliaeth chi
eu ffederaliaeth nhw/hwy
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