el vs overhead railway

el and overhead railway both are nouns.

Word	Noun	Adjective	Verb	Adverb
el	Yes	No	No	No
overhead railway	Yes	No	No	No

As nouns, el and overhead railway are synonyms defined as:

el and overhead railway: a railway that is powered by electricity and that runs on a track that is raised above the street level

Other synonyms of el include elevated, elevated railroad, elevated railway.

el (noun)	overhead railway (noun)
a railway that is powered by electricity and that runs on a track that is raised above the street level	a railway that is powered by electricity and that runs on a track that is raised above the street level