adjoin vs adhere

adjoin and adhere both are verbs.

Word	Noun	Adjective	Verb	Adverb
adjoin	No	No	Yes	No
adhere	No	No	Yes	No

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

adjoin: be in direct physical contact with; make contact
adhere: come or be in close contact with; stick or hold together and resist separation

adjoin (verb)	adhere (verb)
attach or add	follow through or carry out a plan without deviation
lie adjacent to another or share a boundary	stick to firmly
be in direct physical contact with; make contact	come or be in close contact with; stick or hold together and resist separation
	be compatible or in accordance with
	be loyal to
	be a devoted follower or supporter