specialty vs unicity

specialty

noun
  • An attribute or quality peculiar to a species. 

  • A particular or peculiar case. 

  • That in which one specializes; a chosen expertise or talent. 

  • A contract or obligation under seal; a contract by deed; a writing, under seal, given as security for a debt particularly specified. 

  • A product that originates in and is characteristic of a place. 

unicity

noun
  • The state or quality of being unique or one of a kind. 

  • The fact of being united as a whole. 

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