automaton vs droid

automaton

noun
  • A person who acts like a machine or robot, often defined as having a monotonous lifestyle and lacking in emotion. 

  • A machine or robot designed to follow a precise sequence of instructions. 

  • A toy in the form of a mechanical figure. 

  • A formal system, such as a finite-state machine or cellular automaton. 

droid

noun
  • A person having the qualities of an android; one with few or no emotions or little personality, or who acts in an unthinking manner; a robot. 

  • A robot, especially one made with some physical resemblance to a human (an android). 

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