  Quantum entanglement lies at the heart of quantum mechanical and quantum
information processing. Following the question who \emph{witnesses}
entanglement witnesses, we show entangled states play as the role of super
entanglement witnesses. We show separable states play the role of "super super
entanglement witnesses" and "witness" other observables than entanglement
witnesses. We show that there exists a hierarchy structure of witnesses and
there exist "witnesses" everywhere. Furthermore, we show the properties and
characterization of entangled states as super entanglement witnesses. By the
role of super witnesses of entangled states, we immediately find the question
when different entanglement witnesses can detect the same entangled states
[{\it Phys. Lett. A }{\bf 356} 402 (2006)] is the same as the question when
different entangled states can be detected by the same entanglement witnesses
[{\it Phys. Rev. A} {\bf 75} 052333 (2007)]. By the role of "witnesses", we
define finer entangled states and optimal entangled states. The definition
gives a nonnumeric measurement of entanglement and an unambiguous
discrimination of entangled states, and the procedure of optimization for a
general entangled state $\rho$ is just finding the best separable approximation
(BSA) to $\rho$ in [ {\it Phys. Rev. Lett.} {\bf 80} 2261 (1998)].}
