partiality vs tendency

partiality

noun
  • Preference, bias in favor of, tendency. 

  • The quality of being partial or incomplete. 

tendency

noun
  • A likelihood of behaving in a particular way or going in a particular direction; a tending toward. 

  • An organised unit or faction within a larger political organisation. 

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