watercourse vs flume

watercourse and flume both are nouns.

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

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

watercourse: a conduit through which water flows
flume: watercourse that consists of an open artificial chute filled with water for power or for carrying logs

Other hyponyms of watercourse include canal, headrace, tailrace.

watercourse (noun)	flume (noun)
a conduit through which water flows	watercourse that consists of an open artificial chute filled with water for power or for carrying logs
a natural body of running water flowing on or under the earth	a narrow gorge with a stream running through it
natural or artificial channel through which water flows