Thesaurus.com
Dictionary.com
Definitions

gangster

[gang-ster] / ˈgæŋ stər /
NOUN
person involved in illegal activities
Synonyms
STRONGEST
bandit criminal crook hoodlum hooligan mobster racketeer robber soldier thug
STRONG
bruiser dealer desperado goon hood mafioso pusher ruffian tough
WEAK
hit person member of the family
Antonyms
STRONGEST
law police

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.