contributor vs donor

contributor and donor both are nouns.

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

As nouns, donor is a hypernym of contributor; that is, donor is a word with a broader meaning than contributor:

contributor: someone who contributes (or promises to contribute) a sum of money
donor: person who makes a gift of property

Other hypernyms of contributor include bestower, conferrer, giver, presenter.

contributor (noun)	donor (noun)
someone who contributes (or promises to contribute) a sum of money	person who makes a gift of property
a writer whose work is published in a newspaper or magazine or as part of a book	(medicine) someone who gives blood or tissue or an organ to be used in another person (the host)