complexion vs ecosphere

complexion

noun
  • The outward appearance of something. 

  • Outlook, attitude, or point of view. 

  • The quality, colour, or appearance of the skin on the face. 

  • An arrangement. 

verb
  • To give a colour to. 

ecosphere

noun
  • the biosphere 

  • The portion of the atmosphere from sea-level to about 4000 meters in which it is possible to breathe without technological assistance. 

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