blockage vs circumvolution

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. 

circumvolution

noun
  • Anything winding or sinuous. 

  • The act of revolution, rotation or gyration around an axis. 

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