source vs takeoff

source

noun
  • A reporter's informant. 

  • Source code. 

  • The name of one terminal of a field effect transistor (FET). 

  • Spring; fountainhead; wellhead; any collection of water on or under the surface of the ground in which a stream originates. 

  • The person, place, or thing from which something (information, goods, etc.) comes or is acquired. 

verb
  • To obtain or procure: used especially of a business resource. 

  • To find information about (a quotation)'s source (from which it comes): to find a citation for. 

takeoff

noun
  • A parody or lampoon of someone or something. 

  • The spot from which one takes off; specifically, the place from which a jumper rises in leaping. 

  • The removal of sheets from the press. 

  • A quantification, especially of building materials. 

  • The rising or ascent of an aircraft or rocket into flight. 

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