grovel vs serenade

grovel

verb
  • To abase oneself before another person. 

  • To be prone on the ground. 

  • To be slavishly nice to someone or apologize in the hope of securing something. 

  • To take pleasure in mundane activities. 

  • To crawl. 

serenade

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

noun
  • 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. 

  • An instrumental composition in several movements. 

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