plasticity vs pliability

plasticity

noun
  • The quality or state of being plastic. 

  • the property of a solid body whereby it undergoes a permanent change in shape or size when subjected to a stress exceeding a particular value (the yield value) 

pliability

noun
  • The quality or state of being pliable; flexibility; pliableness. 

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