in English is:

synchromesh

Mutations

Soft:gyd-ddant
Nasal:nghyd-ddant
Aspirate:chyd-ddant

Use

y cyd-ddant hwn
fy nghyd-ddant i
dy gyd-ddant di
ei gyd-ddant ef/o
ei chyd-ddant hi
ein cyd-ddant ni
eich cyd-ddant chi
eu cyd-ddant nhw/hwy
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