cautious vs people

cautious and people both are nouns.

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

As nouns, people is a hypernym of cautious; that is, people is a word with a broader meaning than cautious:

cautious: people who are fearful and cautious
people: (plural) any group of human beings (men or women or children) collectively

cautious (noun)	people (noun)
people who are fearful and cautious	(plural) any group of human beings (men or women or children) collectively
	the body of citizens of a state or country
	members of a family line
	the common people generally

cautious (adjective)	people (adjective)
showing careful forethought
avoiding excess

cautious (verb)	people (verb)
	fill with people
	furnish with people