a kind of large river reptile with a long body and mouth

attacker

a member of a gang of armed criminals

person involved in illegal activities

a dangerous criminal

crook

a person shouting, fighting or being rude in the streets or other public places

hoodlum

(GB in the 1970's) describing young people who deliberately shock society through their clothes, language, pop music etc

hoodlum

a rude and violent young man

hoodlum

a supporter of, person involved in, terrorism

subversive