SRO vs sellout

SRO

sellout

noun
  • An action in which principles are compromised for financial gain. 

  • A person who compromises his or her principles for financial gain. 

  • The selling of an entire stock of something, especially tickets for an entertainment or sports event. 

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