come in vs re-enter

come in and re-enter both are verbs.

Word	Noun	Adjective	Verb	Adverb
come in	No	No	Yes	No
re-enter	No	No	Yes	No

As verbs, re-enter is a hyponym of come in; that is, re-enter is a word with a more specific, narrower meaning than come in:

come in (verb)	re-enter (verb)
take a place in a competition; often followed by an ordinal	enter again
to insert between other elements
be received
to come or go into
come into fashion; become fashionable