go under vs come down

go under and come down both are verbs.

Word	Noun	Adjective	Verb	Adverb
go under	No	No	Yes	No
come down	No	No	Yes	No

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

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

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

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

go under (verb)	come down (verb)
be called; go by a certain name	get sick
go under	be the essential element
disappear beyond the horizon	criticize or reprimand harshly
	move downward and lower, but not necessarily all the way
	fall from clouds