The plural form of the word "tooth" is "teeth". However, there are many synonyms for the word "tooths" that can be used in particular contexts. Some of the synonyms include fang, chopper, tusk, denticle, and incisor. "Fang" is mostly used in relation to animals such as dogs, snakes, or cats. "Chopper" is a slang term commonly used to describe teeth, especially large and prominent teeth. "Tusk" is usually used to describe the large, pointed teeth of some animals like elephants or walruses. "Denticle" is a term used to describe the small tooth-like structures on the skin of sharks and rays. Lastly, "incisor" refers to the front teeth used for biting and cutting food.