greedy vs greediness

greedy is not a noun while greediness is a noun.

Word	Noun	Adjective	Verb	Adverb
greedy	No	Yes	No	No
greediness	Yes	No	No	No

greedy (noun)	greediness (noun)
	an excessive desire for wealth (usually in large amounts)
	an excessive desire for food

greedy (adjective)	greediness (adjective)
immoderately desirous of acquiring e.g. wealth
(often followed by `for') ardently or excessively desirous
wanting to eat or drink more than one can reasonably consume