omnibus vs passenger

omnibus and passenger both are nouns.

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

omnibus (noun)	passenger (noun)
a vehicle carrying many passengers; used for public transport	a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
an anthology of articles on a related subject or an anthology of the works of a single author

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