convexity vs umbo

convexity and umbo both are nouns.

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

As nouns, umbo is a hyponym of convexity; that is, umbo is a word with a more specific, narrower meaning than convexity:

Other hyponyms of convexity include camber, entasis, knob, node, thickening, ridge, peak, point, tip, taper, projection.

convexity (noun)	umbo (noun)
the property possessed by a convex shape	a slight rounded elevation where the malleus attaches to the eardrum
a shape that curves or bulges outward