duplicate vs look-alike

duplicate

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. 

verb
  • To produce something equal to. 

  • To make a copy of. 

  • To do repeatedly; to do again. 

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 

look-alike

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