in English is:

Zoroastrianism

Mutations

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

Use

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