equerry vs scullery maid

equerry

noun
  • A personal attendant to a head of state, a member of a royal family, or a national representative. 

  • An officer responsible for the care and supervision of the horses of a person of rank. 

scullery maid

noun
  • A domestic servant, of lowest status, whose job is to wash dishes and do other menial chores. 

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