motorbus vs omnibus

motorbus and omnibus both are nouns.

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

As nouns, motorbus and omnibus are synonyms defined as:

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

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

motorbus (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

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