tailrace vs waterway

tailrace and waterway both are nouns.

Word	Noun	Adjective	Verb	Adverb
tailrace	Yes	No	No	No
waterway	Yes	No	No	No

As nouns, waterway is a hypernym of tailrace; that is, waterway is a word with a broader meaning than tailrace:

tailrace: a watercourse that carries water away from a mill or water wheel or turbine
waterway: a conduit through which water flows

Other hypernyms of tailrace include watercourse.

tailrace (noun)	waterway (noun)
a watercourse that carries water away from a mill or water wheel or turbine	a conduit through which water flows
	a navigable body of water