recess vs concavity

recess and concavity both are nouns.

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

As nouns, concavity is a hypernym of recess; that is, concavity is a word with a broader meaning than recess:

Other hypernyms of recess include concave shape, incurvation, incurvature.

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