folk vs gens

folk and gens both are nouns.

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

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

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

folk (noun)	gens (noun)
the traditional and typically anonymous music that is an expression of the life of people in a community	family based on male descent
people in general (often used in the plural)
a social division of (usually preliterate) people
people descended from a common ancestor