accountable vs at fault

accountable

adj
  • Obliged, when called upon, to answer (for one’s deeds); answerable. 

  • Liable to be called on to render an account. 

  • Capable of being accounted for; explicable; explainable. 

  • Obliged to keep accurate records (of property or funds). 

at fault

prep
  • guilty, responsible, to blame. 

  • Of hunting dogs: unable to find the scent. 

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