demoiselle vs moorhen

demoiselle

noun
  • A damselfly of the family Calopterygidae. 

  • A young lady; a damsel; a lady's maid. 

  • The Numidian crane (Grus virgo). 

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. 

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