bulginess vs roundedness

bulginess and roundedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
bulginess	Yes	No	No	No
roundedness	Yes	No	No	No

As nouns, bulginess and roundedness are synonyms defined as:

bulginess and roundedness: the property possessed by a rounded convexity

bulginess (noun)	roundedness (noun)
the property possessed by a rounded convexity	the property possessed by a rounded convexity