The term "gnasher" refers to a person's teeth, but there are several synonyms for this word. First, the term "pearly whites" refers to teeth that are clean and white, often used to describe a person with a great smile. Another synonym is "pearly gates," a term that refers to the entrance to heaven, but can also be used to describe someone's teeth. "Choppers" is another slang term for teeth, especially those that are large or prominent. "Ivories" is a synonym that refers to teeth that are white and shiny. Finally, the term "fangs" can be used to describe someone's teeth, especially if the person has sharp or pointed teeth like a vampire.