blockage vs reciprocity

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. 

reciprocity

noun
  • A relation of mutual dependence or action or influence. 

  • A reciprocal construction involves two noun phrases where each of the participants occupies both the role of agent and patient with respect to the other. see: Wikipedia:Reciprocal pronoun. 

  • A reciprocal relationship. 

  • The characteristic of being reciprocal, e.g. of a relationship between people. 

  • The mutual exchange of rights, privileges or obligations between nations. see: Wikipedia:Reciprocity (international relations). 

  • The responses of individuals to the actions of others. 

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