What's the Difference Between Ordinary and Degenerate Semiconductors?

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whats the difference between ordinary semiconductor and degenerative semiconductor?
 
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ordinary Semiconductor: The Fermi level (Ef) is located within the gap, and its electronic density is around 10^18.

Degenerative one: Ef is located above the conduction band, and its electronic density is around 10^22. it conducts like a metal which has a low resistivity.
 
The correct term is:

"degenerate statistics"