passenger vehicle vs omnibus

passenger vehicle and omnibus both are nouns.

Word	Noun	Adjective	Verb	Adverb
passenger vehicle	Yes	No	No	No
omnibus	Yes	Yes	No	No

As nouns, passenger vehicle and omnibus are synonyms defined as:

passenger vehicle and omnibus: a vehicle carrying many passengers; used for public transport

Other synonyms of passenger vehicle include autobus, bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach.

passenger vehicle (noun)	omnibus (noun)
a vehicle carrying many passengers; used for public transport	a vehicle carrying many passengers; used for public transport
	an anthology of articles on a related subject or an anthology of the works of a single author

passenger vehicle (adjective)	omnibus (adjective)
	providing for many things at once