You might see "whole wheat" and "whole grain." What's the difference? Let's get granular. Kernels in bread have three parts: Bran, germ and endosperm, according to the U.S. Department of Agriculture.
“Whole grains, such as brown rice, quinoa, oats, and whole wheat, contain all parts of the grain kernel: the bran, germ, and endosperm. This composition preserves their nutrient content and fibre,” ...