Master vs alum

Master

noun
  • A person holding a master's degree, as a title. 

  • The title of the eldest son of a Scots lord. 

  • The title of the head of certain colleges and schools. 

  • The owner of a slave, in some literature. 

  • Used as the title of a dominant. 

  • A master's degree. 

  • A religious teacher, often as an honorific title. 

  • Prepended to a boy's name or surname as a (now somewhat formal) form of address. 

name
  • MasterCard 

  • One of the triune gods of the Horned God in Wicca alongside the Father and Sage and representing a boy or a young man 

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. 

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