rectitude vs vertu

rectitude

noun
  • Conformity to the rules prescribed for moral conduct; (moral) uprightness, virtue. 

  • Straightness; the state or quality of having a constant direction and not being crooked or bent. 

vertu

noun
  • Moral worth; virtue, virtuousness. 

  • Especially with reference to the writings of Machiavelli (1469–1527): the requisite qualities for political or military success; vitality, determination; power. 

  • The fine arts as a subject of study or expertise; understanding of arts and antiquities. 

  • Objets d'art collectively. 

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