undernourishment vs malnourishment

undernourishment and malnourishment both are nouns.

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

As nouns, undernourishment and malnourishment are synonyms defined as:

undernourishment and malnourishment: not having enough food to develop or function normally

undernourishment (noun)	malnourishment (noun)
not having enough food to develop or function normally	not having enough food to develop or function normally