poor people vs plural

poor people and plural both are nouns.

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

poor people (noun)	plural (noun)
people without possessions or wealth (considered as a group)	the form of a word that is used to denote more than one

poor people (adjective)	plural (adjective)
	grammatical number category referring to two or more items or units
	composed of more than one member, set, or kind