trolley vs streetcar

trolley and streetcar both are nouns.

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

As nouns, trolley and streetcar are synonyms defined as:

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

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

trolley (noun)	streetcar (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