airship vs bladder

airship

noun
  • A lighter-than-air aircraft that can be propelled forward through the air as well as steered. 

  • A police air unit, a police helicopter 

  • Any aircraft. 

  • A high ranking official of the RAF, viewed as arrogant and distant. 

verb
  • To transport goods by aircraft. 

bladder

noun
  • A flexible sac that can expand and contract and that holds liquids or gases. 

  • A sealed plastic bag that contains wine and is usually packaged in a cask. 

  • Anything inflated, empty, or unsound. 

  • Specifically, the urinary bladder. 

  • The inflatable bag inside various balls used in sports, such as footballs and rugby balls. 

  • A hollow, inflatable organ of a plant. 

verb
  • To swell out like a bladder with air; to inflate. 

  • To store or put up in bladders. 

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