grandmaternal

As adjectives the difference between grandpaternal and grandmaternal

is that grandpaternal is of or relating to a grandfather while grandmaternal is of or relating to a grandmother.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective grandmaternal is

of or relating to a grandmother.

As a noun grandmother

is a mother of someone's parent.

As an adjective grandmaternal is

of or relating to a grandmother.

Grandmaternal is a hyponym of grandparental.

As adjectives the difference between grandmaternal and grandparental

is that grandmaternal is of or relating to a grandmother while grandparental is of or relating to a grandparent.