impression vs concavity

impression and concavity both are nouns.

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

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

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

impression (noun)	concavity (noun)
an impressionistic portrayal of a person	the property possessed by a concave shape
the act of pressing one thing on or into the surface of another	a shape that curves or bends inward
(dentistry) an imprint of the teeth and gums in wax or plaster
an outward appearance
a vague idea in which some confidence is placed
a clear and telling mental image
a symbol that is the result of printing or engraving
all the copies of a work printed at one time
a concavity in a surface produced by pressing