A grain cutter is a tool used to harvest crops such as wheat, barley, and oats. The three most common types of grain cutters are the scythe, REAPER, and SICKLE. A scythe is a long-handled tool with a curved blade at the end used for cutting grass or grain. A REAPER is a machine that cuts and collects grain in one operation. A SICKLE is a short-handled tool with a curved blade used for cutting grain. All three tools are used to efficiently harvest grain crops.