rain vs waterspout

rain and waterspout both are nouns.

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

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

rain (noun)	waterspout (noun)
anything happening rapidly or in quick successive	a channel through which water is discharged (especially one used for drainage from the gutters of a roof)
water falling in drops from vapor condensed in the atmosphere	a tornado passing over water and picking up a column of water and mist
drops of fresh water that fall as precipitation from clouds	a heavy rain

rain (verb)	waterspout (verb)
precipitate as rain