incommensurable vs peculiar

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. 

peculiar

noun
  • That which is peculiar; a sole or exclusive property; a prerogative; a characteristic. 

  • an ecclesiastical district, parish, chapel or church outside the jurisdiction of the bishop of the diocese in which it is situated. 

adj
  • Common or usual for a certain place or circumstance; specific or particular. 

  • Out of the ordinary; odd; strange; unusual. 

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