entasis vs convexity

entasis and convexity both are nouns.

Word	Noun	Adjective	Verb	Adverb
entasis	Yes	No	No	No
convexity	Yes	No	No	No

As nouns, convexity is a hypernym of entasis; that is, convexity is a word with a broader meaning than entasis:

entasis: a slight convexity in the shaft of a column; compensates for the illusion of concavity that viewers experience when the sides are perfectly straight
convexity: a shape that curves or bulges outward

Other hypernyms of entasis include convex shape.

entasis (noun)	convexity (noun)
a slight convexity in the shaft of a column; compensates for the illusion of concavity that viewers experience when the sides are perfectly straight	the property possessed by a convex shape
	a shape that curves or bulges outward