jumbo jet vs jet plane

jumbo jet and jet plane both are nouns.

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

As nouns, jet plane is a hypernym of jumbo jet; that is, jet plane is a word with a broader meaning than jumbo jet:

Other hypernyms of jumbo jet include jet-propelled plane, jet.

jumbo jet (noun)	jet plane (noun)
a very large jet plane	an airplane powered by one or more jet engines