impediment vs tightness

impediment

noun
  • A hindrance; that which impedes or obstructs progress. 

  • Baggage, especially that of an army; impedimenta. 

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

tightness

noun
  • The quality or degree of being tight 

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