gang vs mob

gang and mob both are nouns.

Word	Noun	Adjective	Verb	Adverb
gang	Yes	No	Yes	No
mob	Yes	No	Yes	No

As nouns, gang and mob are synonyms defined as:

Other synonyms of gang include pack, ring.

gang (noun)	mob (noun)
tool consisting of a combination of implements arranged to work together	a disorderly crowd of people
an organized group of workmen	an association of criminals
an association of criminals	a loose affiliation of gangsters in charge of organized criminal activities
an informal body of friends

gang (verb)	mob (verb)
act as an organized group	press tightly together or cram