greediness vs greedy

greediness is a noun but greedy is not a noun.

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

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

greediness (adjective)	greedy (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