allure vs piquantness

allure

noun
  • The power to attract, entice; the quality causing attraction. 

  • The walkway along the top of a castle wall, sometimes entirely covered and normally behind a parapet; the wall walk. 

verb
  • To entice; to attract. 

piquantness

noun
  • The quality of being piquant. 

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