rabble vs lynch mob

rabble and lynch mob both are nouns.

Word	Noun	Adjective	Verb	Adverb
rabble	Yes	No	No	No
lynch mob	Yes	No	No	No

As nouns, lynch mob is a hyponym of rabble; that is, lynch mob is a word with a more specific, narrower meaning than rabble:

rabble: a disorderly crowd of people
lynch mob: a mob that kills a person for some presumed offense without legal authority

rabble (noun)	lynch mob (noun)
a disorderly crowd of people	a mob that kills a person for some presumed offense without legal authority
disparaging terms for the common people