passenger vs omnibus

passenger and omnibus both are nouns.

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

passenger (noun)	omnibus (noun)
a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it	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 (adjective)	omnibus (adjective)
	providing for many things at once