open up vs break open

open up and break open both are verbs.

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

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

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

open up (verb)	break open (verb)
make available	erupt or intensify suddenly
become available	come open suddenly and violently, as if from internal pressure
talk freely and without inhibition	open with force
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