Hoodlumism, or the act of behaving like a hoodlum, can be substituted with a range of synonyms such as delinquency, thuggery, hooliganism, rowdiness, lawlessness, disorderliness, mischief, vandalism, and anarchy. Each of these words indicates a different type of disruptive or violent behavior, although they all have one thing in common, that is, a disregard for rules, laws, and social norms. While some of these synonyms may connote a certain level of youthfulness or rebellion, they all share an element of destructiveness that can cause harm to individuals, property, and society. Therefore, it's important to remain vigilant and address any signs of hoodlumism or related behavior before it escalates.