camper vs camping bus

camper and camping bus both are nouns.

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

As nouns, camper and camping bus are synonyms defined as:

camper and camping bus: a recreational vehicle equipped for camping out while traveling

Other synonyms of camper include motor home.

camper (noun)	camping bus (noun)
a recreational vehicle equipped for camping out while traveling	a recreational vehicle equipped for camping out while traveling
someone living temporarily in a tent or lodge for recreation