houseboy vs pantryman

houseboy

noun
  • A non-white adult male domestic servant. 

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

pantryman

noun
  • A person in charge of the pantry, or food store, on a ship, train, or other transport where food is kept for passengers and crew. Also in a hospital, school, or hotel, etc. 

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