in English is:

fecundity

Mutations

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

Use

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