blockage vs bottleneck

blockage

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

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

  • The state or condition of being blocked. 

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

bottleneck

noun
  • In traffic, any narrowing of the road, especially resulting in a delay. 

  • The part of a process that is too slow or cumbersome. 

  • The narrow portion that forms the pouring spout of a bottle; the neck of a bottle. 

verb
  • To slow by causing a bottleneck. 

  • To form a bottleneck. 

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