van vs delivery van

van and delivery van both are nouns.

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

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

van (noun)	delivery van (noun)
a truck with an enclosed cargo space	a van suitable for delivering goods or services to customers
a camper equipped with living quarters
(Great Britain) a closed railroad car that carries baggage or freight
the leading units moving at the head of an army
any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts)