blimp vs weather balloon

blimp

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

  • An obese person. 

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

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

weather balloon

noun
  • a balloon that carries meteorological instruments aloft in order to measure, record and return data concerning atmospheric pressure, temperature and humidity 

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