incommensurable vs peripheral

incommensurable

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

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

  • having no common integer divisor except 1. 

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

peripheral

adj
  • Unimportant. 

  • Related to or located in the peripheral nervous system. 

  • Beside the point. 

  • On the periphery or boundary. 

  • Auxiliary. 

noun
  • Peripheral vision. 

  • A peripheral device. 

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