dome vs concavity

dome and concavity both are nouns.

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

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

dome: a concave shape whose distinguishing characteristic is that the concavity faces downward
concavity: a shape that curves or bends inward

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

dome (noun)	concavity (noun)
a hemispherical roof	the property possessed by a concave shape
a stadium that has a roof	a shape that curves or bends inward
informal terms for a human head
a concave shape whose distinguishing characteristic is that the concavity faces downward