Don Quixote vs theorist

Don Quixote

noun

  • Any person or character who displays quixotism. 

name

  • A famous 1605–1615 Spanish novel by Miguel de Cervantes (1547–1616), whose full title is El ingenioso hidalgo don Quijote de la Mancha (The Ingenious Gentleman Don Quixote of La Mancha). 

  • The protagonist of this novel. 

theorist

noun

  • Someone who constructs theories, especially in the arts or sciences. 

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