tailrace vs watercourse

tailrace and watercourse both are nouns.

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

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

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

Other hypernyms of tailrace include waterway.

tailrace (noun)	watercourse (noun)
a watercourse that carries water away from a mill or water wheel or turbine	a conduit through which water flows
	a natural body of running water flowing on or under the earth
	natural or artificial channel through which water flows