van vs camping bus

van and camping bus both are nouns.

Word	Noun	Adjective	Verb	Adverb
van	Yes	No	No	No
camping bus	Yes	No	No	No

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

van: a camper equipped with living quarters
camping bus: a recreational vehicle equipped for camping out while traveling

Other hypernyms of van include camper, motor home.

van (noun)	camping bus (noun)
a truck with an enclosed cargo space	a recreational vehicle equipped for camping out while traveling
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)