Grass pertains to a plant in the grass family (Poaceae). These are usually short plants with slender leaves.
People grow different species of grasses for their lawns. Many animals eat the seeds and leaves. When allowed to grow wild, grasses get several feet tall.
"Grass" is in the HS Code "8433"
Harvesting Or Threshing Machinery, Including Straw Or Fodder Balers; Grass Or Hay Mowers; Machines F