in English is:

sophistry

Mutations

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

Use

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