plugger vs prime mover

plugger

noun
  • One who, or that which, plugs. 

  • A thong or flip-flop. 

  • A dental instrument used to insert fillings. 

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 plugger and prime mover occurred in a corpus of books? (source: Google Ngram Viewer )