Lemmus is a term that refers to a genus of rodents that are commonly known as lemmings. However, there are several synonyms for the word "lemmus". One of the most commonly used synonyms is the term "leming", which is often used interchangeably with lemming. Other synonyms include the terms "arvicoline", which refers to rodents of the subfamily Arvicolinae, which includes lemmings, and "murid", which refers to rodents of the family Muridae, which includes many different species of rodents. Additionally, the term "vole" is sometimes used as a synonym for lemming, although voles are generally a different group of rodents.