waterway vs ditch

waterway and ditch both are nouns.

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

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

Other hyponyms of waterway include mare clausum, mare liberum, rapid.

waterway (noun)	ditch (noun)
a conduit through which water flows	a long narrow excavation in the earth
a navigable body of water	any small natural waterway

waterway (verb)	ditch (verb)
	crash or crash-land
	cut a trench in, as for drainage
	make an emergency landing on water
	forsake
	throw away
	sever all ties with, usually unceremoniously or irresponsibly