depression vs crevice

depression and crevice both are nouns.

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

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

depression (noun)	crevice (noun)
pushing down	a long narrow cleft
sad feelings of gloom and inadequacy	a long narrow depression in a surface
a sunken or depressed geological formation
angular distance below the horizon (especially of a celestial object)
a concavity in a surface produced by pressing
a mental state characterized by a pessimistic sense of inadequacy and a despondent lack of activity
an air mass of lower pressure; often brings precipitation
a long-term economic state characterized by unemployment and low prices and low levels of trade and investment
a state of depression and anhedonia so severe as to require clinical intervention