shaper vs slotting machine

shaper

noun
  • A machine tool in which a single-point cutting tool mounted on a reciprocating ram is traversed across the workpiece linearly. Shapers can generate various shapes, but were most especially employed in generating flat surfaces and keyways. The shaper is nowadays obsolescent, most of its applications being served by milling machines. 

  • One who shapes. 

  • A person who designs and builds surfboards. 

slotting machine

noun
  • A reciprocating machine tool used to cut mortises and to shape openings. 

How often have the words shaper and slotting machine occurred in a corpus of books? (source: Google Ngram Viewer )