incurvature vs concave shape

incurvature and concave shape both are nouns.

Word	Noun	Adjective	Verb	Adverb
incurvature	Yes	No	No	No
concave shape	Yes	No	No	No

As nouns, incurvature and concave shape are synonyms defined as:

Other synonyms of incurvature include concavity, incurvation.

incurvature (noun)	concave shape (noun)
a shape that curves or bends inward	a shape that curves or bends inward