GANGSTER

gangster, mobster

(noun) a criminal who is a member of gang

Source: WordNet® 3.1

Etymology

Noun

gangster

A member of a criminal or street gang.

A member of a professional criminal organization; a racketeer.

Verb

gangster (third-person singular simple present gangsters, present participle gangstering, simple past and past participle gangstered)

To act like a gangster; to commit street crime or run a racket.

Source: Wiktionary