The difference between Absolute pin and Relative pin
When used as nouns, absolute pin means a pin in which moving away the pinned piece would illegally expose the king to check, whereas relative pin means a pin in which moving away the pinned piece would allow capture of a piece other than the king.
check bellow for the other definitions of Absolute pin and Relative pin
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Absolute pin as a noun (chess):
A pin in which moving away the pinned piece would illegally expose the king to check.
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Relative pin as a noun (chess):
A pin in which moving away the pinned piece would allow capture of a piece other than the king.