poor people vs poor

poor people and poor both are nouns.

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

As nouns, poor people and poor are synonyms defined as:

poor people and poor: people without possessions or wealth (considered as a group)

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

poor people (adjective)	poor (adjective)
	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