substitution vs translator

substitution

noun
  • The expansion of the lexicon of a language by native means in correspondence to a foreign term. 

  • The act of substituting or the state of being substituted. 

  • A substitute or replacement. 

  • The replacement of an atom, or group of atoms, in a compound, with another. 

translator

noun
  • A person who converts speech, text, film, or other material into a different language. (Contrasted with interpreter.) 

  • One that makes a new version of a source material in a different language or format. 

  • A computer program that translates something from one language to another using machine translation. 

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