car vs van

car and van both are nouns.

Word	Noun	Adjective	Verb	Adverb
car	Yes	No	No	No
van	Yes	No	No	No

As nouns, van is a hyponym of car; that is, van is a word with a more specific, narrower meaning than car:

car (noun)	van (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a truck with an enclosed cargo space
a wheeled vehicle adapted to the rails of railroad	a camper equipped with living quarters
where passengers ride up and down	(Great Britain) a closed railroad car that carries baggage or freight
the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant	the leading units moving at the head of an army
a conveyance for passengers or freight on a cable railway	any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts)