folk vs country people

folk and country people both are nouns.

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

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

folk (noun)	country people (noun)
the traditional and typically anonymous music that is an expression of the life of people in a community	people raised in or living in a rural environment; rustics
people in general (often used in the plural)	people living in the same country; compatriots
a social division of (usually preliterate) people
people descended from a common ancestor