copy vs differentiation

copy

noun
  • An imitation, sometimes of inferior quality. 

  • 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. 

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

  • A school work pad. 

  • A printed edition of a book or magazine. 

  • The result of gene or chromosomal duplication. 

  • 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. 

differentiation

noun
  • The act of treating one thing as distinct from another, or of creating such a distinction; of separating a class of things into categories; of describing a thing by illustrating how it is different from something else. 

  • The process of separation of cooling magma into various rock types. 

  • The process of applying the derivative operator to a function; of calculating a function's derivative. 

  • The evolutionary process by which one taxonomic group (species, genus, variety, etc.) becomes distinct from another, or acquires distinct features; the result of such a process: distinctness. 

  • The process of developing distinct components. 

  • The process by which the components of multicellular life (cells, organs, etc.) are produced and acquire function, as when a seed develops the root and stem, and the initial stem develops the leaf, branches, and flower buds. 

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