sidetrack vs railroad siding

sidetrack and railroad siding both are nouns.

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

As nouns, sidetrack and railroad siding are synonyms defined as:

sidetrack and railroad siding: a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass

Other synonyms of sidetrack include siding, turnout.

sidetrack (noun)	railroad siding (noun)
a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass	a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass

sidetrack (verb)	railroad siding (verb)
wander from a direct or straight course