omnibus vs rider

omnibus and rider both are nouns.

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

omnibus (noun)	rider (noun)
a vehicle carrying many passengers; used for public transport	a clause that is appended to a legislative bill
an anthology of articles on a related subject or an anthology of the works of a single author	a traveler who actively rides an animal (as a horse or camel)
	a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
	a traveler who actively rides a vehicle (as a bicycle or motorcycle)

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