trolley car vs trolley

trolley car and trolley both are nouns.

Word	Noun	Adjective	Verb	Adverb
trolley car	Yes	No	No	No
trolley	Yes	No	No	No

As nouns, trolley car and trolley are synonyms defined as:

trolley car and trolley: a wheeled vehicle that runs on rails and is propelled by electricity

Other synonyms of trolley car include streetcar, tram, tramcar.

trolley car (noun)	trolley (noun)
a wheeled vehicle that runs on rails and is propelled by electricity	a wheeled vehicle that runs on rails and is propelled by electricity