The term 'incisor' refers to a type of TOOTH found in mammals. It is characterized by its sharp, chisel-like shape and is used for cutting or gnawing food. Incisors are the most anterior teeth in the mouth and are typically the first to erupt. They are usually the smallest teeth in the mouth and have one cusp. The term 'TOOTH' is a five-letter word that refers to the hard, calcified structures found in the mouths of many animals, including humans. Incisors are seven-letter words that refer specifically to the front teeth in the mouth. Carnassials are ten-letter words that refer to the specialized teeth found in carnivorous mammals, which are used for shearing meat.