Cooper's tool is a type of woodworking tool used to shape and smooth wooden objects. The term can refer to four different tools: an ADZ (3 letters), an ADZE (4 letters), a croze (5 letters), and a howel (5 letters). An ADZ is a tool with a curved blade set at right angles to the handle, used for shaping wood. An ADZE is similar to an ADZ but has a straight blade. A croze is a tool used to cut grooves in wood. Lastly, a howel is a tool used to hollow out the inside of a wooden object.