engine vs vehicle

engine

noun
  • Anything used to effect a purpose; any device or contrivance; an agent. 

  • A person or group of people which influence a larger group; a driving force. 

  • A self-powered vehicle, especially a locomotive, used for pulling cars along a track. 

  • A large construction used in warfare, such as a battering ram, catapult etc. 

  • The part of a car or other vehicle which provides the force for motion, now especially one powered by internal combustion. 

  • A complex mechanical device which converts energy into useful motion or physical effects. 

  • A software or hardware system responsible for a specific technical task (usually with qualifying word). 

vehicle

noun
  • A medium for expression of talent or views. 

  • A liquid content (e.g. oil) which acts as a binding and drying agent in paint. 

  • An animal or (rarely) a plant on which a Hindu deity rides or sits 

  • An entity to achieve an end. 

  • A mode or method of spiritual practice; a yana. 

  • The main excipient (such as an oil or gel) that conveys the active ingredient of a drug. 

  • A conveyance; a device for carrying or transporting substances, objects or individuals. 

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