blockade vs embolus

blockade

verb
  • To create a blockade against. 

noun
  • The ships or other forces used to effect a naval blockade. 

  • Inhibition of the activity (function) of chemical messengers or their receptors, such as (often) receptor antagonism. 

  • The physical blocking or surrounding of a place, especially a port, in order to prevent commerce and traffic in or out. 

  • Any form of formal isolation or inhibition of something, especially with the force of law or arms. 

  • Preventing an opponent's pawn moving by placing a piece in front of it. 

embolus

noun
  • An obstruction causing an embolism: a blood clot, air bubble or other matter carried by the bloodstream and causing a blockage or occlusion of a blood vessel. 

  • The structure on the end of the palp of male arachnids which contains the opening to the ejaculatory duct. 

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