watercourse vs body of water

watercourse and body of water both are nouns.

Word	Noun	Adjective	Verb	Adverb
watercourse	Yes	No	No	No
body of water	Yes	No	No	No

As nouns, body of water is a hypernym of watercourse; that is, body of water is a word with a broader meaning than watercourse:

watercourse: a natural body of running water flowing on or under the earth
body of water: the part of the earth's surface covered with water (such as a river or lake or ocean)

Other hypernyms of watercourse include water.

watercourse (noun)	body of water (noun)
a conduit through which water flows	the part of the earth's surface covered with water (such as a river or lake or ocean)
a natural body of running water flowing on or under the earth
natural or artificial channel through which water flows