motorcoach vs omnibus

motorcoach and omnibus both are nouns.

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

As nouns, motorcoach and omnibus are synonyms defined as:

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

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

motorcoach (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

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