airspace vs atmosphere

airspace

noun
  • The portion of an enclosed area which contains air, especially breathable air. 

  • that part of the sky designated for the sole use of aircraft. 

  • The cavity in a cavity wall containing air for insulation. 

  • Space (i.e. a few neighboring frequencies) available for broadcasting within a particular frequency band. 

  • A specified portion of the atmosphere, especially that under the technical aviation control and/or jurisdiction of a particular state over which territory (and territorial waters) it lies. 

atmosphere

noun
  • The air in a particular place. 

  • The gases surrounding the Earth or any astronomical body. 

  • Extras in a scene who have no spoken lines. 

  • The conditions (such as music, illumination etc.) that can influence the mood felt in an environment. 

  • The apparent mood felt in an environment. 

  • A unit of measurement for pressure equal to 101325 Pa (symbol: atm) 

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