trackless trolley vs motorcoach

trackless trolley and motorcoach both are nouns.

Word	Noun	Adjective	Verb	Adverb
trackless trolley	Yes	No	No	No
motorcoach	Yes	No	No	No

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

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

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

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