sidetrack vs siding

sidetrack and siding both are nouns.

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

As nouns, sidetrack and siding are synonyms defined as:

sidetrack and 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 railroad siding, turnout.

sidetrack (noun)	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
	material applied to the outside of a building to make it weatherproof

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