exhalation vs shortness of breath

exhalation

noun
  • The act or process of exhaling; breathing out 

  • A bright phenomenon; a meteor. 

  • That which is exhaled, or which rises in the form of vapor, fume, or steam 

shortness of breath

noun
  • difficulty in breathing; dyspnea 

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