stave in vs stave

stave in is not a noun while stave is a noun.

Word	Noun	Adjective	Verb	Adverb
stave in	No	No	Yes	No
stave	Yes	No	Yes	No

As verbs, stave in and stave are synonyms defined as:

stave in (noun)	stave (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 in (verb)	stave (verb)
burst or force (a hole) into something	burst or force (a hole) into something
break in the staves (of)	furnish with staves