in English is:

tailoring

Mutations

Soft:deilwriaeth
Nasal:nheilwriaeth
Aspirate:theilwriaeth

Use

y deilwriaeth hon
fy nheilwriaeth i
dy deilwriaeth di
ei deilwriaeth ef/o
ei theilwriaeth hi
ein teilwriaeth ni
eich teilwriaeth chi
eu teilwriaeth nhw/hwy
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