Novaculite is a type of sedimentary rock that is often used for sharpening tools, knives, and blades. It is also referred to as Arkansas stone or sharpening stone. Some synonyms for novaculite include whetstone, honing stone, sharpening stone, grindstone, oilstone, and waterstone. These synonyms are often used interchangeably to describe similar stones used for sharpening blades or cutting tools. The term "whetstone" comes from the verb "to whet," which means to sharpen. Meanwhile, the term "honing stone" comes from the verb "to hone," which means to sharpen or refine. Regardless of the synonym used, novaculite stones remain one of the most popular and effective sharpening tools available.