folk song vs shanty

folk song

noun
  • A song in the style of folk music, a modern genre of popular music. 

  • A song, in any folk style, originating among ordinary people, usually non-professional musicians, and handed down by oral tradition. 

  • folk music 

shanty

noun
  • A song a sailor sings, especially in rhythm to his work. 

  • A rudimentary or improvised dwelling, especially one not legally owned. 

  • An unlicensed pub. 

  • A roughly-built hut or cabin. 

adj
  • Jaunty; showy. 

  • Living in shanties; poor, ill-mannered and violent. 

verb
  • To inhabit a shanty. 

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