deepen vs break open

deepen and break open both are verbs.

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

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

deepen (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
become deeper in tone	open with force
make deeper