jet plane vs jetliner

jet plane and jetliner both are nouns.

Word	Noun	Adjective	Verb	Adverb
jet plane	Yes	No	No	No
jetliner	Yes	No	No	No

As nouns, jetliner is a hyponym of jet plane; that is, jetliner is a word with a more specific, narrower meaning than jet plane:

Other hyponyms of jet plane include fan-jet, fanjet, turbofan, turbojet, jumbo jet, jumbojet, twinjet.

jet plane (noun)	jetliner (noun)
an airplane powered by one or more jet engines	a large jet plane that carries passengers