voluptuous vs voluptuousness

voluptuous is not a noun while voluptuousness is a noun.

Word	Noun	Adjective	Verb	Adverb
voluptuous	No	Yes	No	No
voluptuousness	Yes	No	No	No

voluptuous (noun)	voluptuousness (noun)
	the quality of having a well-rounded body
	the property of being lush and abundant and a pleasure to the senses
	the quality of being attractive and exciting (especially sexually exciting)

voluptuous (adjective)	voluptuousness (adjective)
displaying luxury and furnishing gratification to the senses
having strong sexual appeal
(of a woman's body) having a large bosom and pleasing curves