in English is:

oologist

Mutations

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

Use

yr oolegydd hwn
fy oolegydd i
dy oolegydd di
ei oolegydd ef/o
ei hoolegydd hi
ein hoolegydd ni
eich oolegydd chi
eu hoolegydd nhw/hwy
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