blimp vs hot-air balloon

blimp

noun
  • An airship constructed with a non-rigid lifting agent container. 

  • Any large airborne inflatable. 

  • A person similar to the cartoon character Colonel Blimp; a pompous, reactionary British man. 

  • A soundproof cover for a video camera. 

  • An obese person. 

verb
  • To fit (a video camera) with a soundproof cover. 

  • To expand like a blimp or balloon; to become fat. 

hot-air balloon

noun
  • A balloon-shaped aircraft whose bag is inflated with hot air; it carries passengers and crew in a gondola slung underneath. 

How often have the words blimp and hot-air balloon occurred in a corpus of books? (source: Google Ngram Viewer )