stratosphere vs zephyr

stratosphere

noun
  • The region of the uppermost atmosphere where temperature increases along with the altitude due to the absorption of solar ultraviolet radiation by ozone. The stratosphere extends from the tropopause (10–15 kilometers) to approximately 50 kilometers, where it is succeeded by the mesosphere. 

zephyr

noun
  • A light wind from the west. 

  • Anything of fine, soft, or light quality, especially fabric. 

  • Any light refreshing wind; a gentle breeze. 

verb
  • To blow or blow on gently like a zephyr; to cool or refresh with a gentle breeze. 

  • To blow or move like a zephyr, or light breeze. 

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