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HYPHEN
WORDNET DICTIONARY
OXFORD DICTIONARY
THESAURUS

WORDNET DICTIONARY

Noun gangster has 1 sense

• gangster(n = noun.person) mobster - a criminal who is a member of gang; Array
is a member of gang, mob, pack, ring
has particulars: apache, yakuza, yardie, al capone, alphonse capone, capone, scarface
is a kind of criminal, crook, felon, malefactor, outlaw
Derived form noun gang₁

OXFORD DICTIONARY

THESAURUS

gangster

Judas, Mafioso, bad person, bandit, betrayer, brigand, convict, criminal, crook, dacoit, deceiver, delinquent, desperado, desperate criminal, double-dealer, evildoer, felon, fugitive, gallows bird, gaolbird, goon, gunman, gunsel, gunslinger, hit man, hood, hoodlum, hooligan, jailbird, lawbreaker, malefactor, malevolent, malfeasant, malfeasor, misfeasor, mobsman, mobster, mugger, outlaw, public enemy, quisling, racketeer, robber, ruffian, scofflaw, sinner, skinhead, soldier, swindler, thief, thug, torpedo, tough, traitor, transgressor, two-timer, villain, worker of ill, wrongdoer

For further exploring for "gangster" in Webster Dictionary Online