exception vs rarity

exception

noun
  • That which is excluded from others; a person, thing, or case, specified as distinct, or not included. 

  • An objection; cavil; dissent; disapprobation; offense; cause of offense; — usually followed by to or against. 

  • An objection, on legal grounds; also, as in conveyancing, a clause by which the grantor excepts or reserves something before the right is transferred. 

  • An interruption in normal processing, typically caused by an error condition, that can be raised ("thrown") by one part of the program and handled ("caught") by another part. 

  • The act of excepting or excluding; exclusion; restriction by taking out something which would otherwise be included, as in a class, statement, rule. 

rarity

noun
  • A rare object. 

  • A measure of the scarcity of an object. 

  • Thinness; the property of having low density 

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