get in vs get on

get in and get on both are verbs.

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

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

get in (verb)	get on (verb)
of trains; move into (a station)	develop in a positive way
to come or go into	appear in a show, on T.V. or radio
secure a place in a college, university, etc.	grow old or older
succeed in a big way; get to the top	get up on the back of
	grow late or (of time) elapse
	get on board of (trains, buses, ships, aircraft, etc.)
	have smooth relations