burst out vs break open

burst out and break open both are verbs.

Word	Noun	Adjective	Verb	Adverb
burst out	No	No	Yes	No
break open	No	No	Yes	No

As verbs, burst out and break open are synonyms defined as:

Other synonyms of burst out include erupt, flare, flare up, irrupt.

burst out (verb)	break open (verb)
erupt or intensify suddenly	erupt or intensify suddenly
give sudden release to an expression	come open suddenly and violently, as if from internal pressure
appear suddenly or unexpectedly; happen unexpectedly	open with force