become vs come down

become and come down both are verbs.

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

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

Other hyponyms of become include boil down, reduce, choke, suffocate, nucleate, add up, amount, come.

become (verb)	come down (verb)
enter or assume a certain state or condition	get sick
come into existence	be the essential element
undergo a change or development	criticize or reprimand harshly
enhance the appearance of	move downward and lower, but not necessarily all the way
	fall from clouds