cougar vs malkin

cougar

noun
  • Puma concolor, a wild feline native to the Americas. 

  • An older woman who actively seeks the casual, often sexual, companionship of younger men, by implication a female “sexual predator”. 

malkin

noun
  • A hare. 

  • A mop, especially one used to clean a baker's oven. 

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