in English is:

mattress

Mutations

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

Use

y matras hwn
fy matras i
dy fatras di
ei fatras ef/o
ei matras hi
ein matras ni
eich matras chi
eu matras nhw/hwy

or

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