trolley coach vs motorbus

trolley coach and motorbus both are nouns.

Word	Noun	Adjective	Verb	Adverb
trolley coach	Yes	No	No	No
motorbus	Yes	No	No	No

As nouns, motorbus is a hypernym of trolley coach; that is, motorbus is a word with a broader meaning than trolley coach:

trolley coach: a passenger bus with an electric motor that draws power from overhead wires
motorbus: a vehicle carrying many passengers; used for public transport

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

trolley coach (noun)	motorbus (noun)
a passenger bus with an electric motor that draws power from overhead wires	a vehicle carrying many passengers; used for public transport