asperity vs diplomacy

asperity

noun
  • The quality of being harsh or severe in the way one speaks or behaves toward people. 

  • An area that protrudes from a surface. 

  • A section of a fault line with high friction, such that there is no movement along this part of the fault except during an earthquake. 

  • The quality of being difficult or unpleasant to experience. 

  • The quality of having a rough or uneven surface. 

  • Something that is harsh and difficult to endure. 

diplomacy

noun
  • Tact and subtle skill in dealing with people so as to avoid or settle hostility. 

  • The art and practice of conducting international relations by negotiating alliances, treaties, agreements etc., bilaterally or multilaterally, between states and sometimes international organizations, or even between polities with varying status, such as those of monarchs and their princely vassals. 

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