The term "graining instrument" typically refers to a woodworking tool used for creating patterns and textures on wood surfaces. Some synonyms for this tool might include a "woodgraining tool," which is a more specific term commonly used in the industry, or simply a "texturing tool," which could apply to a wider range of materials and techniques. Other possible synonyms might include "graining brush," "woodworking comb," or "veining tool," depending on the specific design and function of the instrument in question. No matter what the name, however, a good graining instrument can be an indispensable tool for adding depth and character to any woodworking project.