There are several synonyms for the word "aero-train." Some commonly used words are maglev, bullet train, high-speed train, and monorail. Maglev stands for "magnetic levitation" and refers to a train that uses magnetic levitation to travel at high speeds. Bullet train is a term used for high-speed trains that were designed in Japan. High-speed train describes any train that travels at a speed greater than 200 km/h. Lastly, monorail is a type of train that runs on a single rail and is often used in amusement parks. These synonyms are often used interchangeably to describe trains that are designed to travel at high speeds and offer quick transportation.