Barbary dove vs cushat

Barbary dove

noun
  • A domesticated dove with unclear taxonomic classification, often treated as its own species as Streptopelia risoria, sometimes as a subspecies of either Eurasian collared dove, Streptopelia decaocto or African collared dove Streptopelia roseogrisea, and sometimes not as separate species at all, freely breeding with the above species. 

cushat

noun
  • A pigeon, wood pigeon or ring dove. 

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