canal vs waterway

canal and waterway both are nouns.

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

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

Other hypernyms of canal include watercourse.

canal (noun)	waterway (noun)
long and narrow strip of water made for boats or for irrigation	a conduit through which water flows
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance	a navigable body of water
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion

canal (verb)	waterway (verb)
provide (a city) with a canal