cero vs kingfisher

cero

noun
  • A large scombroid food fish (Scomberomorus regalis) found chiefly in the West Indies. 

kingfisher

noun
  • common kingfisher (Alcedo atthis) 

  • Any of various birds of the suborder Alcedines (or the family Alcedinidae sensu lato), having a large head, short tail and brilliant colouration; they feed mostly on fish. 

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