streetcar vs trolley

streetcar and trolley both are nouns.

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

As nouns, streetcar and trolley are synonyms defined as:

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

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

streetcar (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