get on vs get in

get on and get in both are verbs.

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

As verbs, get in is a hypernym of get on; that is, get in is a word with a broader meaning than get on:

Other hypernyms of get on include come in, enter, get into, go in, go into, move into.

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