donor vs bestower

donor and bestower both are nouns.

Word	Noun	Adjective	Verb	Adverb
donor	Yes	No	No	No
bestower	Yes	No	No	No

As nouns, donor and bestower are synonyms defined as:

Other synonyms of donor include conferrer, giver, presenter.

donor (noun)	bestower (noun)
person who makes a gift of property	person who makes a gift of property
(medicine) someone who gives blood or tissue or an organ to be used in another person (the host)