in English is:

geophysics

Mutations

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

* This form is an exception to the mutation rules.

Use

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