Indo-Hittite, also known as Indo-Anatolian, refers to a hypothetical and disputed language family that would have included both the Indo-European languages and those of the Hittite civilization in Anatolia. The term "Indo-Hittite" is often used interchangeably with terms such as "Proto-Indo-European Anatolian" or "Indo-Anatolian". Alternative synonyms that have been suggested for "Indo-Hittite" include "Indo-Aryan Hittite", "Aryan Anadolic", and "Indo-European Hittite". However, it's important to note that none of these terms are universally accepted and there is ongoing debate in the field of linguistics about the existence and nature of the Indo-Hittite language family.