trolley coach vs trolleybus

trolley coach and trolleybus both are nouns.

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

As nouns, trolley coach and trolleybus are synonyms defined as:

trolley coach and trolleybus: a passenger bus with an electric motor that draws power from overhead wires

Other synonyms of trolley coach include trackless trolley.

trolley coach (noun)	trolleybus (noun)
a passenger bus with an electric motor that draws power from overhead wires	a passenger bus with an electric motor that draws power from overhead wires