borzoi vs sighthound

borzoi

noun
  • A dog of a particular breed, similar in shape to a greyhound but with longer silkier hair. 

sighthound

noun
  • A hound that primarily hunts by sight and speed, instead of by scent and endurance. 

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