elevator car vs compartment

elevator car and compartment both are nouns.

Word	Noun	Adjective	Verb	Adverb
elevator car	Yes	No	No	No
compartment	Yes	No	No	No

As nouns, compartment is a hypernym of elevator car; that is, compartment is a word with a broader meaning than elevator car:

elevator car: where passengers ride up and down
compartment: a partitioned section, chamber, or separate room within a larger enclosed area

elevator car (noun)	compartment (noun)
where passengers ride up and down	a partitioned section, chamber, or separate room within a larger enclosed area
	a space into which an area is subdivided