concavity vs hollowness

concavity and hollowness both are nouns.

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

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

concavity (noun)	hollowness (noun)
the property possessed by a concave shape	the property of having a sunken area
a shape that curves or bends inward	the quality of not being open or truthful; deceitful or hypocritical
	the state of being hollow: having an empty space within