destructor vs prime mover

destructor

noun
  • A furnace or oven for the burning or carbonizing of refuse. 

  • A function that runs when an object is no longer required, used to release any resources that it was using. 

  • One who destructs. 

prime mover

noun
  • A person or thing that is seminal and influential. 

  • The front part of a semi-trailer type truck, i.e., the tractor to which the trailer part attaches. 

  • A military or heavy construction vehicle. 

  • The initial agent that is the cause of all things. 

  • A machine, such as a water wheel or steam engine, that receives and modifies energy as supplied by some natural source or fuel and transforms it into mechanical work 

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