hail vs come down

hail is a noun but come down is not a noun.

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

As verbs, come down is a hypernym of hail; that is, come down is a word with a broader meaning than hail:

Other hypernyms of hail include fall, precipitate.

hail (noun)	come down (noun)
enthusiastic greeting
many objects thrown forcefully through the air
precipitation of ice pellets when there are strong rising air currents

hail (verb)	come down (verb)
greet enthusiastically or joyfully	get sick
call for	be the essential element
praise vociferously	criticize or reprimand harshly
be a native of	move downward and lower, but not necessarily all the way
precipitate as small ice particles	fall from clouds