cyborg vs droid

cyborg

noun
  • A human, animal or other being with electronic or bionic prostheses. 

  • A being which is part machine and part organic. 

verb
  • To convert (something) into a cyborg. 

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 cyborg and droid occurred in a corpus of books? (source: Google Ngram Viewer )