earl vs laird

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. 

laird

noun
  • A feudal lord in Scottish contexts. 

  • An aristocrat, particularly in Scottish contexts and in reference to the chiefs of the Scottish clans. 

  • A landowner, particularly in Scottish contexts. 

verb
  • Chiefly as laird it over: to behave like a laird, particularly to act haughtily or to domineer; to lord (it over). 

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