There are several synonyms for the term "pirate bus". A pirate bus is a bus that operates illegally without proper licenses and certifications. Some of the common synonyms for pirate bus are rogue bus, pirated coach, illegal transport, unregistered transit, and unauthorized bus. The term "pirate bus" is usually associated with safety concerns, as these buses do not follow the proper safety regulations and often put the passengers' lives at risk. Therefore, it's important to be aware of these synonyms and avoid using such modes of transportation. Government authorities must also take necessary steps to halt the operation of pirate buses to ensure the safety of citizens.