quarterlight vs car window

quarterlight and car window both are nouns.

Word	Noun	Adjective	Verb	Adverb
quarterlight	Yes	No	No	No
car window	Yes	No	No	No

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

quarterlight: car window consisting of a small pivoted glass vent in the door of a car
car window: a window in a car

quarterlight (noun)	car window (noun)
car window consisting of a small pivoted glass vent in the door of a car	a window in a car