Supererogant :: Supereminent (a.) Eminent in a superior degree; surpassing others in excellence; as, a supereminent divine; the supereminent glory of Christ..
Supererogate :: Supererogating (p. pr. & vb. n.) of Supererogat.
Supererogation :: Supererogate (v. i.) To do more than duty requires; to perform works of supererogation; to atone (for a dificiency in another) by means of a surplus action or quality.
Supererogative :: Supererogation (n.) The act of supererogating; performance of more than duty or necessity requires.