Au reste is a French term that translates to "remaining" or "moreover" in English. Some synonyms for this term include "besides", "additionally", "furthermore", "also", "in addition", and "moreover". These words can be used interchangeably with au reste when writing or speaking to add more emphasis to a point or to introduce additional information. It's important to remember that while synonyms can convey similar meanings, the context of the sentence or conversation can alter the use of each word. So, it's essential to choose the proper synonym according to the intended meaning of the sentence.