rapacious vs rapaciousness

rapacious is not a noun while rapaciousness is a noun.

Word	Noun	Adjective	Verb	Adverb
rapacious	No	Yes	No	No
rapaciousness	Yes	No	No	No

rapacious (noun)	rapaciousness (noun)
	extreme gluttony
	an excessive desire for wealth (usually in large amounts)
	(of an animal, usually a bird) The quality of subsisting off live prey.

rapacious (adjective)	rapaciousness (adjective)
excessively greedy and grasping
living by preying on other animals especially by catching living prey
devouring or craving food in great quantities