Yes, donor is in the scrabble dictionary

...and is worth 7 points by itself.

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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.

from The American Heritage Dictionary of the English Language, 4th Edition

Electronics An element introduced into a semiconductor with a negative valence greater than that of the pure semiconductor.

from The American Heritage Dictionary of the English Language, 4th Edition

Medicine An individual from whom blood, tissue, or an organ is taken for transfusion, implantation, or transplant.

from The American Heritage Dictionary of the English Language, 4th Edition

One that contributes something, such as money, to a cause or fund.

from The American Heritage Dictionary of the English Language, 4th Edition

One that gives, donates, or presents something.

from Free Scrabble Dictionary

adjective

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

from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points	Points
donor	6

2 letter words with DONOR	Points
do	3
no	2
or	2
on	2
od	3

3 letter words with DONOR	Points
don	4
roo	3
rod	4
ono	3
nor	3
noo	3
nod	4
dor	4

4 letter words with DONOR	Points
odor	5
ordo	5
door	5
rood	5

5 letter words with DONOR	Points
donor	6
rondo	6

Found 19 words in 0.12752 seconds