houseboy vs menial

houseboy

noun
  • A non-white adult male domestic servant. 

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

menial

noun
  • A servant, especially a domestic servant. 

  • A person who has a subservient nature. 

adj
  • Of or relating to unskilled work. 

  • Servile; low; mean. 

  • Of or relating to work normally performed by a servant. 

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