in English is:

sewerage

,

drainage

Mutations

Soft:garthffosiaeth
Nasal:ngharthffosiaeth
Aspirate:charthffosiaeth

Use

y garthffosiaeth hon
fy ngharthffosiaeth i
dy garthffosiaeth di
ei garthffosiaeth ef/o
ei charthffosiaeth hi
ein carthffosiaeth ni
eich carthffosiaeth chi
eu carthffosiaeth nhw/hwy
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