open up vs unbolt

open up and unbolt both are verbs.

Word	Noun	Adjective	Verb	Adverb
open up	No	No	Yes	No
unbolt	No	No	Yes	No

As verbs, unbolt is a hyponym of open up; that is, unbolt is a word with a more specific, narrower meaning than open up:

Other hyponyms of open up include unbar, break open, click open, reopen, unlock, unseal, uncork, jimmy, lever, prise, prize, pry, breach, gap, lance.

open up (verb)	unbolt (verb)
make available	undo the bolt of
become available
talk freely and without inhibition
cause to open or to become open
become open
open up an area or prepare a way
start to operate or function or cause to start operating or functioning