waterway vs flume

waterway and flume both are nouns.

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

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

waterway: 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 waterway include canal, headrace, tailrace.

waterway (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 navigable body of water	a narrow gorge with a stream running through it