downpour vs waterspout

downpour and waterspout both are nouns.

Word	Noun	Adjective	Verb	Adverb
downpour	Yes	No	No	No
waterspout	Yes	No	No	No

As nouns, downpour and waterspout are synonyms defined as:

Other synonyms of downpour include cloudburst, deluge, pelter, soaker, torrent.

downpour (noun)	waterspout (noun)
a heavy rain	a channel through which water is discharged (especially one used for drainage from the gutters of a roof)
	a tornado passing over water and picking up a column of water and mist
	a heavy rain