intensify vs break open

intensify and break open both are verbs.

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

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

intensify (verb)	break open (verb)
become more intense	erupt or intensify suddenly
make more intense, stronger, or more marked	come open suddenly and violently, as if from internal pressure
increase in extent or intensity	open with force
make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark