canker vs come down

canker is a noun but come down is not a noun.

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

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

Other hypernyms of canker include sicken.

canker (noun)	come down (noun)
a pernicious and malign influence that is hard to get rid of
an ulceration (especially of the lips or lining of the mouth)
a fungal disease of woody plants that causes localized damage to the bark

canker (verb)	come down (verb)
infect with a canker	get sick
become infected with a canker	be the essential element
	criticize or reprimand harshly
	move downward and lower, but not necessarily all the way
	fall from clouds