moorhen vs puma

moorhen

noun
  • A female red grouse, Lagopus lagopus scotica. 

  • Any of various medium-sized water birds of the genus Gallinula, of the rail family, that feed in open water margins. 

puma

noun
  • Any feline belonging to the genus Puma. 

  • A woman in her 20s or 30s who seeks relationships with younger men; a younger cougar. 

  • A mountain lion or cougar (Puma concolor). 

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