cougar vs mouser

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”. 

mouser

noun
  • A cat that catches mice, kept specifically for the purpose. 

  • A moustache. 

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