Professor vs fellowship

Professor

noun
  • The title for someone who holds the professor job. 

fellowship

noun
  • A temporary position at an academic institution with limited teaching duties and ample time for research. 

  • A period of supervised, sub-specialty medical training in the United States and Canada that a physician may undertake after completing a specialty training program or residency. 

  • A feeling of friendship, relatedness or connection between people. 

  • A merit-based scholarship. 

  • A company of people that share the same interest or aim. 

verb
  • To join in fellowship; to associate with. 

  • To admit to fellowship, enter into fellowship with; to make feel welcome by showing friendship or building a cordial relationship. Now only in religious use. 

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