motorbus vs motorcoach

motorbus and motorcoach both are nouns.

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

As nouns, motorbus and motorcoach are synonyms defined as:

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

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

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