streetcar track vs rails

streetcar track and rails both are nouns.

Word	Noun	Adjective	Verb	Adverb
streetcar track	Yes	No	No	No
rails	Yes	No	No	No

streetcar track (noun)	rails (noun)
the track on which trams or streetcars run	a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll