A back kick is a type of kick where the foot is swung towards the back. It is a powerful move that is used in various forms of martial arts and self-defense. However, there are several different ways to describe this type of kick. Some synonyms for a back kick may include a reverse kick, a back thrust, or a rear kick. Other options may include a counter-kick, a backspin kick, or a spinning heel kick. These terms can be used interchangeably depending on the context of the situation, but all refer to the basic movement of kicking towards the back of the body.