elevated railroad vs railway

elevated railroad and railway both are nouns.

Word	Noun	Adjective	Verb	Adverb
elevated railroad	Yes	No	No	No
railway	Yes	No	No	No

As nouns, railway is a hypernym of elevated railroad; that is, railway is a word with a broader meaning than elevated railroad:

elevated railroad: a railway that is powered by electricity and that runs on a track that is raised above the street level
railway: line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight

Other hypernyms of elevated railroad include railroad, railroad line, railway line, railway system.

elevated railroad (noun)	railway (noun)
a railway that is powered by electricity and that runs on a track that is raised above the street level	line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight
	a line of track providing a runway for wheels