Bundles of wheat are often referred to as either 'fiber' or 'sheaves'. Fiber is a five-letter word that refers to the stalks of wheat, while sheaves is a seven-letter word that refers to the bundles of wheat. Wheat is a cereal grain that has been cultivated for thousands of years and is one of the most important crops in the world. It is used to make flour, which is then used to make bread, pasta, and other food products.