pin up vs attach

pin up and attach both are verbs.

Word	Noun	Adjective	Verb	Adverb
pin up	No	No	Yes	No
attach	No	No	Yes	No

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

pin up (verb)	attach (verb)
attach with or as if with a pin	become attached
	cause to be attached
	be attached; be in contact with
	take temporary possession of as a security, by legal authority
	create social or emotional ties