in English is:

seamanship

Mutations

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

Use

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