anthem vs motet

anthem

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

  • A very popular song or track. 

  • A hymn of praise or loyalty. 

verb
  • To celebrate with anthems. 

motet

noun
  • A composition adapted to sacred words in the elaborate polyphonic church style; an anthem. 

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