break in vs break-in

break in is not a noun while break-in is a noun.

Word	Noun	Adjective	Verb	Adverb
break in	No	No	Yes	No
break-in	Yes	No	No	No

break in (noun)	break-in (noun)
	trespassing for an unlawful purpose; illegal entrance into premises with criminal intent

break in (verb)	break-in (verb)
make submissive, obedient, or useful
break so as to fall inward
start in a certain activity, enterprise, or role
break into a conversation
intrude on uninvited
enter someone's (virtual or real) property in an unauthorized manner, usually with the intent to steal or commit a violent act