van vs army unit

van and army unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
van	Yes	No	No	No
army unit	Yes	No	No	No

As nouns, army unit is a hypernym of van; that is, army unit is a word with a broader meaning than van:

van (noun)	army unit (noun)
a truck with an enclosed cargo space	a military unit that is part of an army
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)