houseboy vs lackey

houseboy

noun
  • A non-white adult male domestic servant. 

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

lackey

noun
  • A footman, a liveried male servant. 

  • A fawning, servile follower. 

verb
  • To attend, wait upon, serve obsequiously. 

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