hungry vs hungriness

hungry is not a noun while hungriness is a noun.

Word	Noun	Adjective	Verb	Adverb
hungry	No	Yes	No	No
hungriness	Yes	No	No	No

hungry (noun)	hungriness (noun)
	strong desire for something (not food or drink)
	prolonged unfulfilled desire or need
	a physiological need for food; the consequence of food deprivation

hungry (adjective)	hungriness (adjective)
feeling hunger; feeling a need or desire to eat food
(usually followed by `for') extremely desirous