come in vs get on

come in and get on both are verbs.

Word	Noun	Adjective	Verb	Adverb
come in	No	No	Yes	No
get on	No	No	Yes	No

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

come in (verb)	get on (verb)
take a place in a competition; often followed by an ordinal	develop in a positive way
to insert between other elements	appear in a show, on T.V. or radio
be received	grow old or older
to come or go into	get up on the back of
come into fashion; become fashionable	grow late or (of time) elapse
	get on board of (trains, buses, ships, aircraft, etc.)
	have smooth relations