motorcoach vs motorbus

motorcoach and motorbus both are nouns.

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

As nouns, motorcoach and motorbus are synonyms defined as:

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

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

motorcoach (noun)	motorbus (noun)
a vehicle carrying many passengers; used for public transport	a vehicle carrying many passengers; used for public transport