Trigeminus is a term commonly used in the medical field to describe the fifth cranial nerve, which is responsible for sensory and motor functions in the face. However, there are several synonyms that can be used in place of the word trigeminus. These include the following: trigeminal nerve, fifth nerve, CN V, and cranial nerve V. These terms provide alternative ways to refer to the nerve, and may be used depending on the context or the individual's familiarity with medical terminology. Regardless of the term used, understanding the functions and anatomy of the trigeminus or cranial nerve V is crucial for proper diagnosis and treatment of related conditions.