rapaciousness vs rapacious

rapaciousness is a noun but rapacious is not a noun.

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

rapaciousness (noun)	rapacious (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.

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