waterspout vs downpour

waterspout and downpour both are nouns.

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

As nouns, waterspout and downpour are synonyms defined as:

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

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