attach vs adjoin

attach and adjoin both are verbs.

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

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

Other hypernyms of attach include contact, meet, touch.

attach (verb)	adjoin (verb)
become attached	attach or add
cause to be attached	lie adjacent to another or share a boundary
be attached; be in contact with	be in direct physical contact with; make contact
take temporary possession of as a security, by legal authority
create social or emotional ties