contribute vs further

contribute is not an adjective while further is an adjective.

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

As verbs, further is a hypernym of contribute; that is, further is a word with a broader meaning than contribute:

Other hypernyms of contribute include advance, boost, encourage, promote.

contribute (adjective)	further (adjective)
	more distant in especially degree

contribute (verb)	further (verb)
contribute to some cause	contribute to the progress or growth of
bestow a quality on	promote the growth of
provide
be conducive to

contribute (adverb)	further (adverb)
	to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense)
	to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense)
	in addition or furthermore