indentation vs incurvature

indentation and incurvature both are nouns.

Word	Noun	Adjective	Verb	Adverb
indentation	Yes	No	No	No
incurvature	Yes	No	No	No

As nouns, incurvature is a hypernym of indentation; that is, incurvature is a word with a broader meaning than indentation:

Other hypernyms of indentation include concave shape, concavity, incurvation.

indentation (noun)	incurvature (noun)
the act of cutting into an edge with toothlike notches or angular incisions	a shape that curves or bends inward
the space left between the margin and the start of an indented line
the formation of small pits in a surface as a consequence of corrosion
a concave cut into a surface or edge (as in a coastline)