rabble vs folk

rabble and folk both are nouns.

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

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

Other hypernyms of rabble include common people, folks.

rabble (noun)	folk (noun)
a disorderly crowd of people	the traditional and typically anonymous music that is an expression of the life of people in a community
disparaging terms for the common people	people in general (often used in the plural)
	a social division of (usually preliterate) people
	people descended from a common ancestor