in English is:

interplay

Mutations

Soft:gydadwaith
Nasal:nghydadwaith
Aspirate:chydadwaith

Use

y cydadwaith hwn
fy nghydadwaith i
dy gydadwaith di
ei gydadwaith ef/o
ei chydadwaith hi
ein cydadwaith ni
eich cydadwaith chi
eu cydadwaith nhw/hwy
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