biosphere vs homestead

biosphere

noun
  • The totality of living organisms and their environment. 

  • The part of the Earth and its atmosphere capable of supporting life. 

homestead

verb
  • To acquire or settle on land as a homestead. 

noun
  • A house together with surrounding land and buildings, especially on a farm; the property comprising these. 

  • The place that is one's home. 

  • A parcel of land in the interior of North America, usually 160 acres, that was distributed to settlers from Europe or eastern North America under the Dominion Lands Act of 1870 in Canada or the Homestead Act of 1862 in the United States. 

  • A cluster of several houses occupied by an extended family. 

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