adapt vs vary

adapt and vary both are verbs.

Word	Noun	Adjective	Verb	Adverb
adapt	No	No	Yes	No
vary	No	No	Yes	No

As verbs, vary is a hypernym of adapt; that is, vary is a word with a broader meaning than adapt:

adapt: make fit for, or change to suit a new purpose
vary: become different in some particular way, without permanently losing one's or its former characteristics or essence

Other hypernyms of adapt include alter, change.

adapt (verb)	vary (verb)
make fit for, or change to suit a new purpose	become different in some particular way, without permanently losing one's or its former characteristics or essence
adapt or conform oneself to new or different conditions	make something more diverse and varied
	be at variance with; be out of line with
	be subject to change in accordance with a variable