quantifiable vs quantitative

quantifiable

adj
  • Capable of being quantified. 

noun
  • Something that can be quantified; a measurable. 

quantitative

adj
  • Of a measurement based on some quantity or number rather than on some quality 

  • Of a form of analysis that determines the amount of some element or compound in a sample 

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