contributor vs giver

contributor and giver both are nouns.

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

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

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

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

contributor (noun)	giver (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	someone who devotes himself completely