trackless trolley vs coach

trackless trolley and coach both are nouns.

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

As nouns, coach is a hypernym of trackless trolley; that is, coach 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
coach: a vehicle carrying many passengers; used for public transport

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

trackless trolley (noun)	coach (noun)
a passenger bus with an electric motor that draws power from overhead wires	a carriage pulled by four horses with one driver
	a railcar where passengers ride
	a vehicle carrying many passengers; used for public transport
	a person who gives private instruction (as in singing, acting, etc.)
	(sports) someone in charge of training an athlete or a team

trackless trolley (verb)	coach (verb)
	teach and supervise (someone); act as a trainer or coach (to), as in sports
	drive or operate a coach or carriage