neediness vs needy

neediness and needy both are nouns.

Word	Noun	Adjective	Verb	Adverb
neediness	Yes	No	No	No
needy	Yes	Yes	No	No

neediness (noun)	needy (noun)
the quality of needing attention and affection and reassurance to a marked degree	needy people collectively
a state of extreme poverty

neediness (adjective)	needy (adjective)
	demanding or needing attention, affection, or reassurance to an excessive degree
	poor enough to need help from others