The difference between Grandparent and Paternal grandmother
When used as nouns, grandparent means the parent of someone's parent, whereas paternal grandmother means one's father's mother.
check bellow for the other definitions of Grandparent and Paternal grandmother
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Grandparent as a noun:
the parent of someone's parent
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Grandparent as a verb:
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Paternal grandmother as a noun:
One's father's mother; the grandmother on one's father's side.