earl vs seignior

earl

noun
  • A British or Irish nobleman next in rank above a viscount and below a marquess; equivalent to a European count. A female using the style is termed a countess. 

  • Any of various nymphalid butterflies of the genus Tanaecia. Other butterflies in this genus are called counts and viscounts. 

seignior

noun
  • A feudal lord; a nobleman who held his lands by feudal grant; any lord (holder) of a manor 

  • A title of respect, formerly corresponding (especially in France) approximately to Sir. 

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