cohere vs adjoin

cohere and adjoin both are verbs.

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

As verbs, adjoin is a hypernym of cohere; that is, adjoin is a word with a broader meaning than cohere:

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

Other hypernyms of cohere include contact, meet, touch.

cohere (verb)	adjoin (verb)
come or be in close contact with; stick or hold together and resist separation	attach or add
have internal elements or parts logically connected so that aesthetic consistency results	lie adjacent to another or share a boundary
cause to form a united, orderly, and aesthetically consistent whole	be in direct physical contact with; make contact