agitator vs shaper

agitator

noun
  • An implement for shaking or mixing. 

  • One of a body of men appointed by the army, in Oliver Cromwell's time, to look after their interests. 

  • One who agitates; one who stirs up or excites others, for example political reformers. 

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. 

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