headwaiter vs houseboy

headwaiter

noun
  • A waiter who has a supervisory position over the other wait staff; chief waiter. 

houseboy

noun
  • A non-white adult male domestic servant. 

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

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