watercourse vs tailrace

watercourse and tailrace both are nouns.

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

As nouns, tailrace is a hyponym of watercourse; that is, tailrace is a word with a more specific, narrower meaning than watercourse:

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

Other hyponyms of watercourse include canal, flume, headrace.

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