Adze

An adze looks like an axe but has its cutting edge mounted perpendicular to the handle rather than in line with it, swung down and back toward the user's own feet (carefully) rather than forward the way an axe is swung. That orientation makes it suited to hollowing and dressing broad, flat or gently curved surfaces -- a bowl blank, a log being squared into a beam, a chair seat's hollow -- work that would be awkward or impossible to reach with an axe or plane.

It's largely a green-woodworking and timber-framing tool today, reached for anywhere a large amount of material needs removing fast from a surface before finer tools (a drawknife, a plane) take over for smoothing.