plural vs rich people

plural and rich people both are nouns.

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

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

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