circumstantial vs exceptional

circumstantial

adj
  • Abounding with minor circumstances; in great detail; particular. 

  • Pertaining to or dependent on circumstances, especially as opposed to essentials; incidental, not essential. 

  • Suggesting guilt, but not proving it conclusively. 

  • Full of circumstance or pomp; ceremonial. 

noun
  • Something incidental to the main subject, but of less importance. 

exceptional

adj
  • Forming an exception; not ordinary; uncommon; rare. 

  • Corresponding to something of lower dimension under a birational correspondence. 

  • Better than the average; superior due to exception or rarity. 

noun
  • An exception, or something having an exceptional value 

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