carnival vs national holiday

carnival

noun
  • A festive occasion marked by parades and sometimes special foods and other entertainment. 

  • Any of a number of festivals held just before the beginning of Lent. 

  • A traveling amusement park, called a funfair in British English. 

national holiday

noun
  • A public holiday. 

  • A statutory holiday enacted by a country to commemorate the country itself. 

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