fissure vs chink

fissure and chink both are nouns.

Word	Noun	Adjective	Verb	Adverb
fissure	Yes	No	Yes	No
chink	Yes	No	Yes	No

As nouns, chink is a hyponym of fissure; that is, chink is a word with a more specific, narrower meaning than fissure:

fissure (noun)	chink (noun)
(anatomy) a long narrow slit or groove that divides an organ into lobes	a short light metallic sound
a long narrow cleft	a narrow opening as e.g. between planks in a wall
a long narrow depression in a surface	(ethnic slur) offensive term for a person of Chinese descent

fissure (verb)	chink (verb)
break into fissures or fine cracks	make cracks or chinks in
	fill the chinks of, as with caulking
	make or emit a high sound