jointer

noun

1. (literally)One that joints.
2. Any of various tools used to construct or finish joints, especially:
3. Any of various tools used to construct or finish joints, especially:
4. Any of various tools used to construct or finish joints, especially:
5. An equivalent machine, notably used to produce a flat surface on boards.
6. A part of some ploughs, near the coulter, that helps control the flow of stubble and trash, better ensuring that it gets buried when the moldboard turns the soil over.

   “Holonyms: plough, plow < implement”