disparate vs incommensurable

disparate

noun
  • Any of a group of unequal or dissimilar things. 

adj
  • Utterly unlike; incapable of being compared; having no common ground. 

  • Composed of inherently different or distinct elements; incongruous. 

  • Essentially different; of different species, unlike but not opposed in pairs 

incommensurable

noun
  • An incommensurable value or quantity; an irrational number. 

adj
  • Not able to be measured by the same standards as another term in the context. 

  • having a ratio that is not expressible as a fraction of two integers. 

  • having no common integer divisor except 1. 

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