anthem vs national anthem

anthem

noun
  • A very popular song or track. 

  • A choral or vocal composition, often with a religious or political lyric. 

  • A hymn of praise or loyalty. 

verb
  • To celebrate with anthems. 

national anthem

noun
  • The official song of a constituent state of a country. 

  • The official song of a nation or sovereign state, generally of a patriotic nature and played at events to celebrate or honor said state. 

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