gander vs kestrel

gander

noun
  • A male goose. 

  • A fool, simpleton. 

  • A man living apart from his wife. 

  • A glance, look. 

verb
  • ramble, wander 

kestrel

noun
  • Any of various small falcons of the genus Falco that hover while hunting. 

  • The common kestrel, Falco tinnunculus. 

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