laborer vs navvy

laborer

noun
  • One who uses body strength instead of intellectual power to earn a wage, usually hourly. 

navvy

noun
  • A laborer on a civil engineering project such as a canal or railroad. 

verb
  • To carry out physical labor on a civil engineering project. 

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