hunger vs hungriness

hunger and hungriness both are nouns.

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

As nouns, hunger and hungriness are synonyms defined as:

Other synonyms of hunger include thirst, thirstiness.

As nouns, hunger and hungriness are synonyms defined as:

hunger and hungriness: a physiological need for food; the consequence of food deprivation

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

hunger (verb)	hungriness (verb)
be hungry; go without food
have a craving, appetite, or great desire for
feel the need to eat