Planer
Part of speech: adjective
Definition: Of a surface: flat or level.
Part of speech: noun
Definition: A woodworking tool which smooths a surface or makes one surface of a workpiece parallel to the tool's bed. A large machine tool in which the workpiece is traversed linearly (by means of a reciprocating bed) beneath a single-point cutting tool. (Analogous to a shaper but larger and with the workpiece moving instead of the tool.) Planers can generate various shapes, but were most especially used to generate large, accurate flat surfaces. The planer is nowadays obsolescent, having been mostly superseded by large milling machines.
Plane
Part of speech: adjective
Definition: Of a surface: flat or level.
Part of speech: verb
Definition: To smooth (wood) with a plane.To move in a way that lifts the bow of a boat out of the water.To glide or soar.
Part of speech: noun
Definition: A flat surface extending infinitely in all directions (e.g. horizontal or vertical plane).A level of existence. (eg, astral plane)A roughly flat, thin, often moveable structure used to create lateral force by the flow of air or water over its surface, found on aircraft, submarines, etc.Any of a number of designated ranges of sequential code points.A tool for smoothing wood by removing thin layers from the surface.An airplane; an aeroplane.A deciduous tree of the genus Platanus.A sycamore.
Example sentence: Crystals grew inside rock like arithmetic flowers. They lengthened and spread, added plane to plane in an awed and perfect obedience to an absolute geometry that even stones - maybe only the stones - understood.