When it comes to keeping children safe in a car, child seats are a must-have item. However, there are several other terms used to describe these safety devices. One popular synonym for child seats is car seats. This term is used interchangeably with child seats and refers to a safety device that is specifically designed to protect infants and children in a vehicle. Another synonym for child seats is booster seats, which are designed to help children transition from a child seat to the car's regular seatbelt. Baby seats are also another term used to describe child seats, as they are specifically designed for infants. Ultimately, no matter what terminology you use, the most important thing is to make sure that the child seat is used correctly and safely.