trolleybus vs coach

trolleybus and coach both are nouns.

Word	Noun	Adjective	Verb	Adverb
trolleybus	Yes	No	No	No
coach	Yes	No	Yes	No

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

trolleybus: 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 trolleybus include autobus, bus, charabanc, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle.

trolleybus (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

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