contribute vs contribution

contribute is not a noun while contribution is a noun.

Word	Noun	Adjective	Verb	Adverb
contribute	No	No	Yes	No
contribution	Yes	No	No	No

contribute (noun)	contribution (noun)
	act of giving in common with others for a common purpose especially to a charity
	a writing for publication especially one of a collection of writings as an article or story
	the effort contributed by a person in bringing about a result
	a voluntary gift (as of money or service or ideas) made to some worthwhile cause
	an amount of money contributed