corporation vs megacorp

corporation

noun
  • A body corporate, created by law or under authority of law, having a continuous existence independent of the existences of its members, and powers and liabilities distinct from those of its members. 

  • The municipal governing body of a borough or city. 

  • In Fascist Italy, a joint association of employers' and workers' representatives. 

megacorp

noun
  • A very large corporation; megacorporation. 

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