• ==== Definitions by Merriam-Webster ====

• Anonymity:

  The quality or state of being anonymous

• Anonymous:

  1: of unknown authorship or origin 
  2: not named or identified 
  3: lacking individuality, distinction, or recognizability

• Accountability:

  The quality or state of being accountable; especially : 
  an obligation or willingness to accept responsibility or to account for one's actions

• Accountable:

  1: subject to giving an account : answerable 
  2: capable of being accounted for

  (Merriam-Webster, 2012)