indenture vs concave shape

indenture and concave shape both are nouns.

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

As nouns, concave shape is a hypernym of indenture; that is, concave shape is a word with a broader meaning than indenture:

Other hypernyms of indenture include concavity, incurvation, incurvature.

indenture (noun)	concave shape (noun)
a contract binding one party into the service of another for a specified term	a shape that curves or bends inward
formal agreement between the issuer of bonds and the bondholders as to terms of the debt
the space left between the margin and the start of an indented line
a concave cut into a surface or edge (as in a coastline)

indenture (verb)	concave shape (verb)
bind by or as if by indentures, as of an apprentice or servant