The difference between Grandfather and Paternal grandfather
When used as nouns, grandfather means a father of someone's parent, whereas paternal grandfather means the father of one's father.
Grandfather is also verb with the meaning: to retain existing laws or rules only for people or organizations previously affected by them, and to apply new laws or rules to the unaffected people or organizations.
check bellow for the other definitions of Grandfather and Paternal grandfather
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Grandfather as a noun:
A father of someone's parent.
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Grandfather as a noun (by extension):
A male forefather.
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Grandfather as a verb (intransitive, law):
To retain existing laws or rules only for people or organizations previously affected by them, and to apply new laws or rules to the unaffected people or organizations.
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Grandfather as a verb (transitive, law):
To retain existing laws or rules for (a person or organization previously affected by them).
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Paternal grandfather as a noun:
The father of one's father.