in English is:

bugle

Mutations

Soft:lesyn y coed
Nasal:nglesyn y coed
Aspirate:(no mutation)

Use

y glesyn y coed hwn
fy nglesyn y coed i
dy lesyn y coed di
ei lesyn y coed ef/o
ei glesyn y coed hi
ein glesyn y coed ni
eich glesyn y coed chi
eu glesyn y coed nhw/hwy
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