concavity vs recess

concavity and recess both are nouns.

Word	Noun	Adjective	Verb	Adverb
concavity	Yes	No	No	No
recess	Yes	No	Yes	No

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

concavity (noun)	recess (noun)
the property possessed by a concave shape	a pause from doing something (as work)
a shape that curves or bends inward	an enclosure that is set back or indented
	an arm off of a larger body of water (often between rocky headlands)
	a small concavity
	a state of abeyance or suspended business