blockage vs rapidity

blockage

noun
  • Synonym of constipation (“impairment of feces passage”). 

  • The thing that is the cause of such a state, blocking a passage. 

  • The state or condition of being blocked. 

  • Synonym of thrombosis, synonym of thromboembolism, or synonym of embolism. 

rapidity

noun
  • A measure of the velocity of a particle in a beam relative to the beam's axis 

  • speed, swiftness; the condition of being rapid 

  • A measure of velocity relative to the speed of light 

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