A.k.a. is an abbreviation used for the phrase "also known as." It is commonly used to refer to someone who has multiple names or aliases. However, there are several other synonyms that can be used to convey the same message. Some of the synonyms for a.k.a. include "alias," "pseudonym," "nom de plume," "handle," "nickname," and "moniker." Each of these words refers to someone who goes by a different name or identity. These words can be used interchangeably with a.k.a. to describe a person who goes by different names. Regardless of which synonym is used, the meaning remains the same - another name or identity that someone goes by.