rich people vs plural

rich people and plural both are nouns.

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

rich people (noun)	plural (noun)
people who have possessions and wealth (considered as a group)	the form of a word that is used to denote more than one

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