mannerism vs oddity

mannerism

noun
  • A noticeable personal habit, a verbal or other (often, but not necessarily unconscious) habitual behavior peculiar to an individual. 

  • In fine art, a style that is inspired by previous models, aiming to reproduce subjects in an expressive language. 

  • Exaggerated or affected style in art, speech, or other behavior. 

  • In literature, an ostentatious and unnatural style of the second half of the sixteenth century. In the contemporary criticism, described as a negation of the classicist equilibrium, pre-Baroque, and deforming expressiveness. 

oddity

noun
  • An odd or strange thing or opinion. 

  • Strangeness. 

  • A strange person; an oddball. 

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