junior vs professor

junior

noun
  • A third-year student at a high school or university. 

  • A younger person. 

  • A junior barrister. 

  • A name suffix used after a son's name when his father has the same name (abbreviations: Jnr., Jr., Jun.). 

adj
  • Belonging to a younger person, or an earlier time of life. 

  • Low in rank; having a subordinate role, job, or situation. 

  • Younger. 

  • Of or pertaining to a third academic year in a four-year high school (eleventh grade) or university. 

professor

noun
  • A teacher or faculty member at a college or university regardless of formal rank. 

  • The most senior rank for an academic at a university or similar institution, informally also known as "full professor." 

  • A pianist in a saloon, brothel, etc. 

  • The puppeteer who performs a Punch and Judy show; a Punchman. 

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