bottleneck vs inhibitor

bottleneck

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

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

  • 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. 

inhibitor

noun
  • Any substance capable of stopping or slowing a specific biological process 

  • Any substance capable of stopping or slowing a specific chemical reaction. 

  • One who or that which inhibits. 

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