Ancient language refers to any language that has been used in the distant past, which are no longer in use in modern times. Synonyms for ancient language may include archaic languages or dead languages. Archaic languages are those that are no longer used in modern times but were used regularly in previous times. Dead languages on the other hand refer to languages that have no living speakers or written records. Other synonyms may include historical language, extinct language, antique language, or classical language. These synonyms can be used to describe any language used in ancient times, and each term can provide a different perspective depending on the context in which it is used.