poorly vs poor

poorly is not a noun while poor is a noun.

Word	Noun	Adjective	Verb	Adverb
poorly	No	Yes	No	Yes
poor	Yes	Yes	No	No

poorly (noun)	poor (noun)
	people without possessions or wealth (considered as a group)

poorly (adjective)	poor (adjective)
somewhat ill or prone to illness	having little money or few possessions
	lacking in quality or substances
	characterized by or indicating poverty
	of insufficient quantity to meet a need
	deserving or inciting pity

poorly (adverb)	poor (adverb)
(`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well