Avion, a French term that means "aircraft," has a few synonyms that might come in handy when exploring the field of aviation. One of the most common synonyms for avion is airplane, which is widely used in North America. Another synonym is aeroplane, which is used in British English. In addition, aircraft can also be used as a synonym for avion, as it covers all types of vehicles that can fly in the air, including airplanes, helicopters, and drones. Lastly, a lesser-known synonym for avion is flying machine, which is a more generic term that includes all devices that are capable of sustained flight.