needy vs impoverished

needy is a noun but impoverished is not a noun.

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

As adjectives, needy and impoverished are synonyms defined as:

Other synonyms of needy include destitute, indigent, necessitous, poverty-stricken.

needy (noun)	impoverished (noun)
needy people collectively

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