non-gradable vs par excellence

non-gradable

adj
  • (of an adjective) Describing a quality that cannot normally be varied because it is extreme (e.g. freezing), absolute (e.g. dead), or classification (e.g. nuclear). 

  • That cannot be graded. 

noun
  • Any adjective that is not gradable. 

par excellence

adj
  • Being a quintessential example of a general type. 

  • Being the proper or truest example of a general name. 

adv
  • Because or on account of one's excellence. 

  • In a superior way, in the most representative or fully-developed manner. 

  • Most especially, in particular, most notably (out of a thing or person's other attributes, roles, etc.). 

How often have the words non-gradable and par excellence occurred in a corpus of books? (source: Google Ngram Viewer )