copy vs duplicate

copy

noun
  • The result of copying; an identical duplicate of an original. 

  • The text of newspaper articles. 

  • Writing paper of a particular size, called also bastard. 

  • The output of copywriters, who are employed to write material which encourages consumers to buy goods or services. 

  • A school work pad. 

  • A printed edition of a book or magazine. 

  • The result of gene or chromosomal duplication. 

  • An imitation, sometimes of inferior quality. 

  • The text that is to be typeset. 

  • A gender-neutral abbreviation for copy boy. 

verb
  • To produce an object identical to a given object. 

  • To give or transmit a copy to (a person). 

  • To place a copy of an object in memory for later use. 

  • To imitate. 

  • To receive a transmission successfully. 

duplicate

noun
  • One that resembles or corresponds to another; an identical copy. 

  • A pawnbroker's ticket, which must be shown when redeeming a pledged item. 

  • The game of duplicate bridge. 

  • The game of duplicate Scrabble. 

  • A biological specimen that was gathered alongside another specimen and represents the same species. 

  • An original instrument repeated; a document which is the same as another in all essential particulars, and differing from a mere copy in having all the validity of an original 

verb
  • To produce something equal to. 

  • To make a copy of. 

  • To do repeatedly; to do again. 

adj
  • In which the hands of cards, tiles, etc. are preserved between rounds to be played again by other players. 

  • Being the same as another; identical, often having been copied from an original. 

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