come down vs sleet

come down is not a noun while sleet is a noun.

Word	Noun	Adjective	Verb	Adverb
come down	No	No	Yes	No
sleet	Yes	No	Yes	No

As verbs, sleet is a hyponym of come down; that is, sleet is a word with a more specific, narrower meaning than come down:

Other hyponyms of come down include rain, rain down, spat, snow, hail.

come down (noun)	sleet (noun)
	partially melted snow (or a mixture of rain and snow)

come down (verb)	sleet (verb)
get sick	precipitate as a mixture of rain and snow
be the essential element
criticize or reprimand harshly
move downward and lower, but not necessarily all the way
fall from clouds