impediment vs infarction

impediment

noun
  • A disability, especially one affecting the hearing or speech. 

  • Baggage, especially that of an army; impedimenta. 

  • A hindrance; that which impedes or obstructs progress. 

infarction

noun
  • The process which causes an infarct. 

  • An infarct (an area of ischemic necrosis). 

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