different between convexity vs protuberance

English

convex +? -ity

convexity (countable and uncountable, plural convexities)

The state of being convex.
A convex line or surface.
(finance) A measure of the curvature in the relationship between the prices and yields of bonds.

From French protubérance, from Latin pr?tub?rantia (“bulge; protuberance”), from pr? + t?ber (“swelling; protuberance”) + -antia (“-ance”).

protuberance (plural protuberances)

A bulge, knob, swelling, spine or anything that protrudes.
- 1989 — Ben Aaronovitch, Remembrance of the Daleks
  Ever since their creation the Daleks have been attempting to conquer and enslave as much of the universe as they could get their grubby little protuberances on.
Synonyms: bulge, bump, protrusion

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