in English is:

buoyancy

Mutations

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

Use

yr hynofedd hwn
fy hynofedd i
dy hynofedd di
ei hynofedd ef/o
ei hynofedd hi
ein hynofedd ni
eich hynofedd chi
eu hynofedd nhw/hwy
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