advocacy vs blockage

advocacy

noun
  • the practice of supporting someone to make their voice heard 

  • the profession of an advocate 

  • the act of arguing in favour of, or supporting someone or something 

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. 

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