come down vs become

come down and become both are verbs.

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

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

Other hypernyms of come down include turn.

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