alum vs doctor

alum

noun
  • A past attendee or graduate (of either gender) of a college, university or other educational institution. 

  • Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations. 

  • An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K₂SO₄·Al₂(SO₄)₃·24H₂O). 

verb
  • To steep in, or otherwise impregnate with, a solution of alum; to treat with alum. 

doctor

noun
  • A person who has attained a doctorate, such as a Ph.D. or Th.D. or one of many other terminal degrees conferred by a college or university. 

  • A physician; a member of the medical profession; one who is trained and licensed to heal the sick or injured. The final examination and qualification may award a doctor degree in which case the post-nominal letters are D.O., DPM, M.D., DMD, DDS, in the US or MBBS in the UK. 

  • A veterinarian; a medical practitioner who treats non-human animals. 

  • A fish, the friar skate. 

  • A nickname for a person who has special knowledge or talents to manipulate or arrange transactions. 

verb
  • To act as a medical doctor to. 

  • To physically alter (medically or surgically) a living being in order to change growth or behavior. 

  • To act as a medical doctor. 

  • To alter or make obscure, as with the intention to deceive, especially a document. 

  • To genetically alter an extant species. 

  • To make (someone) into an (academic) doctor; to confer a doctorate upon. 

  • To adulterate, drug, or poison (drink). 

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