siding vs railroad track

siding and railroad track both are nouns.

Word	Noun	Adjective	Verb	Adverb
siding	Yes	No	No	No
railroad track	Yes	No	No	No

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

siding: a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
railroad track: a line of track providing a runway for wheels

Other hypernyms of siding include railroad, railway.

siding (noun)	railroad track (noun)
a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass	a line of track providing a runway for wheels
material applied to the outside of a building to make it weatherproof