elevator vs escalator

elevator

noun
  • Anything that raises or uplifts. 

  • A dental instrument used to pry up ("elevate") teeth in difficult extractions, or depressed portions of bone. 

  • A type of shoe having an insert lift to make the wearer appear taller. 

  • A permanent construction with a built-in platform or cab that can be raised and lowered, used to transport people and goods, as between different floors of a building. 

  • Any muscle that serves to raise a part of the body, such as the leg or the eye. 

  • A control surface of an aircraft responsible for controlling the pitching motion of the machine. 

  • A silo used for storing wheat, corn or other grain (grain elevator). 

escalator

noun
  • Anything that escalates. 

  • An escalator clause. 

  • A motor-driven mechanical device consisting of a continuous loop of steps that automatically conveys people from one floor to another. 

  • An upward or progressive course. 

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