stave vs break open

stave is a noun but break open is not a noun.

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

As verbs, break open is a hypernym of stave; that is, break open is a word with a broader meaning than stave:

Other hypernyms of stave include burst, split.

stave (noun)	break open (noun)
one of several thin slats of wood forming the sides of a barrel or bucket
a crosspiece between the legs of a chair
(music) the system of five horizontal lines on which the musical notes are written

stave (verb)	break open (verb)
burst or force (a hole) into something	erupt or intensify suddenly
furnish with staves	come open suddenly and violently, as if from internal pressure
	open with force