stop up vs chink

stop up is not a noun while chink is a noun.

Word	Noun	Adjective	Verb	Adverb
stop up	No	No	Yes	No
chink	Yes	No	Yes	No

As verbs, chink is a hyponym of stop up; that is, chink is a word with a more specific, narrower meaning than stop up:

Other hyponyms of stop up include stopper, stopple, tampon, cork, cork up.

stop up (noun)	chink (noun)
	a short light metallic sound
	a narrow opening as e.g. between planks in a wall
	(ethnic slur) offensive term for a person of Chinese descent

stop up (verb)	chink (verb)
fill or close tightly with or as if with a plug	make cracks or chinks in
	fill the chinks of, as with caulking
	make or emit a high sound