contribute vs alter

contribute and alter both are verbs.

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

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

Other hypernyms of contribute include change, modify.

contribute (verb)	alter (verb)
contribute to some cause	remove the ovaries of
bestow a quality on	become different in some particular way, without permanently losing one's or its former characteristics or essence
provide	cause to change; make different; cause a transformation
be conducive to	insert words into texts, often falsifying it thereby
	make an alteration to