alight vs come down

alight is an adjective but come down is not an adjective.

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

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

Other hypernyms of alight include descend, fall, go down.

alight (adjective)	come down (adjective)
lighted up by or as by fire or flame

alight (verb)	come down (verb)
come down	get sick
to come to rest, settle	be the essential element
	criticize or reprimand harshly
	move downward and lower, but not necessarily all the way
	fall from clouds