Nunnation is a linguistic term that refers to the adding of an "n" sound at the end of a word. This phenomenon is common in certain languages, including Arabic and Persian. Despite its specific definition, there are several synonyms for nunnation that are used interchangeably in different contexts. These include nunation, anunation, tanween, nunation mark, and final "-n". Nunnation is often characterized as a grammatical marker that changes the case or gender of a word. While the term may not be familiar to everyone, its synonyms are useful for those studying linguistics and language structures.