chap vs crevice

chap and crevice both are nouns.

Word	Noun	Adjective	Verb	Adverb
chap	Yes	No	Yes	No
crevice	Yes	No	No	No

As nouns, crevice is a hypernym of chap; that is, crevice is a word with a broader meaning than chap:

Other hypernyms of chap include cleft, crack, fissure, scissure.

As nouns, chap and crevice are synonyms defined as:

Other synonyms of chap include crack, cranny, fissure.

chap (noun)	crevice (noun)
(usually in the plural) leather leggings without a seat; joined by a belt; often have flared outer flaps; worn over trousers by cowboys to protect their legs	a long narrow cleft
a crack in a lip caused usually by cold	a long narrow depression in a surface
a boy or man
a long narrow depression in a surface

chap (verb)	crevice (verb)
crack due to dehydration