The difference between Grandpa and Pa
When used as nouns, grandpa means grandfather, whereas pa means father, papa.
check bellow for the other definitions of Grandpa and Pa
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Grandpa as a noun (informal):
grandfather
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Pa as a noun (colloquial):
Father, papa.
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Pa as a noun (colloquial):
Grandpa, grandfather.
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Pa as a noun:
a Maori fort