folk vs people

folk and people both are nouns.

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

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

folk: people in general (often used in the plural)
people: (plural) any group of human beings (men or women or children) collectively

As nouns, people is a hyponym of folk; that is, people is a word with a more specific, narrower meaning than folk:

Other hyponyms of folk include homefolk, house, dynasty, gens, name.

folk (noun)	people (noun)
the traditional and typically anonymous music that is an expression of the life of people in a community	(plural) any group of human beings (men or women or children) collectively
people in general (often used in the plural)	the body of citizens of a state or country
a social division of (usually preliterate) people	members of a family line
people descended from a common ancestor	the common people generally

folk (verb)	people (verb)
	fill with people
	furnish with people