1) Bulginess 2) Chubbiness 3) Convexity 4) Convexness 5) Plumpness 1) Bulginess 2) Ellipticity 3) Oblateness 
In phonetics, vowel roundedness refers to the amount of rounding in the lips during the articulation of a vowel. It is labialization of a vowel. When pronouncing a rounded vowel, the lips form a circular opening, while unrounded vowels (also called spread vowels) are pronounced with the lips relaxed. In most languages, front vowels tend to be unro...
[n] - the property possessed by a rounded convexity
bulginess noun the property possessed by a rounded convexity