1) Capo 2) Capone 3) Gangster 4) Mafioso 5) Scarface 6) Wiseguy 7) Yakuza 8) Yardie 1) Capone or Luciano 2) Cosa Nostra member 3) Criminal 4) Criminal gang member 5) Crook 6) De niro role, frequently 7) Felon 8) Gangland figure 9) Gangster 10) Guy with a racket 11) Hood 12) Hoodlum 13) Malefactor 14) One of the Untouchables 15) Organised crime figure 16) Outlaw 17) Person with a racket 
Mobster is American slang for a gangster.
a member of a criminal mob.