The difference between Partial pin and Relative pin
When used as nouns, partial pin means a pin where a rook or queen is pinned along a file, or a bishop or queen is pinned along a diagonal, 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 Partial pin and Relative pin
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Partial pin as a noun (chess):
A pin where a rook or queen is pinned along a file, or a bishop or queen is pinned along a diagonal.
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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.