Scrabble Dictionary

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Yes, donor is playable

...and is worth 7 points.

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OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Donor" Definition

noun

Chemistry An atom, molecule, or ion that provides a part to combine with an acceptor, especially an atom that provides two electrons to form a bond with another atom.
Electronics An element introduced into a semiconductor with a negative valence greater than that of the pure semiconductor.
Medicine An individual from whom blood, tissue, or an organ is taken for transfusion, implantation, or transplant.
One that contributes something, such as money, to a cause or fund.
One that gives, donates, or presents something.

adjective

Medicine Used for transfusion, implantation, or transplant: a donor organ.