butt in vs break in

butt in and break in both are verbs.

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

As verbs, butt in and break in are synonyms defined as:

Other synonyms of butt in include barge in, chime in, chisel in, cut in, put in.

butt in (verb)	break in (verb)
break into a conversation	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