milker vs milkmaid

milker

noun
  • An animal, such as a dairy cow, kept for the milk it produces. 

  • A woman’s breast. 

  • A milking machine. 

  • A person who milks. 

  • A conservative poker player who only raises the stakes on a good hand. 

milkmaid

noun
  • A girl or young woman who milks the cows on a farm 

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