break up vs come in

break up and come in both are verbs.

Word	Noun	Adjective	Verb	Adverb
break up	No	No	Yes	No
come in	No	No	Yes	No

As verbs, come in is a hyponym of break up; that is, come in is a word with a more specific, narrower meaning than break up:

break up (verb)	come in (verb)
laugh unrestrainedly	take a place in a competition; often followed by an ordinal
break or cause to break into pieces	to insert between other elements
come to an end	be received
separate (substances) into constituent elements or parts	to come or go into
cause to go into a solution	come into fashion; become fashionable
cause to separate
close at the end of a session
bring the association of to an end or cause to break up
make a break in
set or keep apart
break violently or noisily; smash
attack with or as if with a pickaxe of ice or rocky ground, for example
release ice
destroy the completeness of a set of related items
take apart into its constituent pieces
suffer a nervous breakdown
disband
to cause to separate and go in different directions
discontinue an association or relation; go different ways