copycat vs thrasher

copycat

noun
  • A criminal who imitates the crimes of another; specifically, a criminal who commits the same crime, especially a highly-publicized one, that has just been or recently committed by someone else. 

  • One who imitates or plagiarizes others' work. 

adj
  • Imitative; unoriginal. 

verb
  • To act as a copycat; to copy in a shameless or derivative way 

thrasher

noun
  • One who thrashes. 

  • Any of several New World passerine songbirds, of the genera Toxostoma, Allenia, Margarops, Oreoscoptes and Ramphocinclus in the family Mimidae, that have a long, downward-curved beak. 

  • A fan of thrash metal music. 

  • A thresher shark. 

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