undernourishment vs hungriness

undernourishment and hungriness both are nouns.

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

As nouns, hungriness is a hypernym of undernourishment; that is, hungriness is a word with a broader meaning than undernourishment:

undernourishment: not having enough food to develop or function normally
hungriness: a physiological need for food; the consequence of food deprivation

Other hypernyms of undernourishment include hunger.

undernourishment (noun)	hungriness (noun)
not having enough food to develop or function normally	strong desire for something (not food or drink)
	prolonged unfulfilled desire or need
	a physiological need for food; the consequence of food deprivation