downland vs humpback

downland

noun
  • An area of rolling hills (downs), often grassy pasture over chalk or limestone. 

humpback

noun
  • A rounded topographical feature, such as a mountain or hill. 

  • A humped back (deformity in humans caused by abnormal curvature of the upper spine). 

  • A hump or protuberance on the shoulders or back of an animal. 

  • A humpback whale. 

  • A person with a humpback; a person who suffers from kyphosis. 

  • A humpback salmon. 

verb
  • To hunt humpback whales. 

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