houseboy vs laborer

houseboy

noun
  • A non-white adult male domestic servant. 

  • A young male domestic servant, especially in a British colony in former times. 

laborer

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

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