motet vs serenade

motet

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

serenade

noun
  • An instrumental composition in several movements. 

  • A love song that is sung directly to one's love interest, especially one performed below the window of a loved one in the evening. 

verb
  • To sing or play a serenade for (someone). 

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