rails vs streetcar track

rails and streetcar track both are nouns.

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

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