instrument vs motor

instrument

noun
  • A person used as a mere tool for achieving a goal. 

  • A legal document, such as a contract, deed, trust, mortgage, power, indenture, or will. 

  • A device used to produce music. 

  • A means or agency for achieving an effect. 

  • A tool, implement used for manipulation or measurement. 

  • A measuring or displaying device. 

verb
  • To devise, conceive, cook up, plan. 

  • To perform upon an instrument; to prepare for an instrument. 

  • To apply measuring devices. 

motor

noun
  • A source of power for something; an inspiration; a driving force. 

  • The fermenting mass of fruit that is the basis of pruno, or "prison wine". 

  • A motor car, or automobile, even a goods vehicle. 

  • Any protein capable of converting chemical energy into mechanical work. 

  • A machine or device that converts other energy forms into mechanical energy, or imparts motion. 

verb
  • To rotate a jet engine or turboprop using the engine's starter, without introducing fuel into the engine. 

  • To progress at a brisk pace. 

  • To leave. 

adj
  • Relating to motor cars. 

  • Propelled by an internal combustion engine (as opposed to a steam engine or turbine). 

  • Relating to the ability to move. 

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