Anti-terrorist is a term used to describe measures taken to prevent or combat terrorism. There are various synonyms that can be used to describe the same concept. Some of these synonyms include counterterrorism, antiterrorism, and counterinsurgency. Counterterrorism is often used to describe the tactics and strategies used to prevent terrorist attacks, while antiterrorism generally refers to measures taken to respond to a terrorist attack. Counterinsurgency, on the other hand, is a broader term that refers to efforts to combat any type of subversive activity, including terrorism. Ultimately, each of these terms refers to the same basic concept of fighting against terrorism and keeping communities safe.