further vs contribute

further is an adjective but contribute is not an adjective.

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

As verbs, contribute is a hyponym of further; that is, contribute is a word with a more specific, narrower meaning than further:

Other hyponyms of further include connive at, wink at, cultivate, foster, further, spur, help, carry, feed, conduce, lead.

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

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

further (adverb)	contribute (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