become vs boil down

become and boil down both are verbs.

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

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

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

become (verb)	boil down (verb)
enter or assume a certain state or condition	cook until very little liquid is left
come into existence	be cooked until very little liquid is left
undergo a change or development	be the essential element
enhance the appearance of