android vs droid

android

noun
  • A robot that is designed to look and act like a human being (not necessarily a male one). 

adj
  • Of the pelvis, having a narrow anterior segment and a heart-shaped brim, typically found in the male. 

  • Possessing human qualities. 

droid

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

  • 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. 

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