Hi Mohamed F,
By default, Cisco has 3 privilege enabled. The 3 privileges are:
privilege level 0 — Includes the disable, enable, exit, help, and logout commands.
privilege level 1 — Normal level on Telnet; includes all user-level commands at the router> prompt.
privilege level 15 — Includes all enable-level commands at the router# prompt.
Since Cisco IOS Release 10.3, Cisco routers enable an administrator to configure multiple privilege levels. Configuring privilege levels is especially useful in a help desk environment where certain administrators must be able to configure and monitor every part of the router (level 15), and other administrators need only to monitor, not configure, the router (customized levels 2 to 14).
So as an answer to your question: the commands list per privilege level from 2 to 14 is defined by the administrator.
An administrator can define multiple customized privilege levels and assign different commands to each level. The higher the privilege level, the more router access a user has. Commands that are available at lower privilege levels are also executable at higher levels, because a privilege level includes the privileges of all lower levels. For example, a user authorized for privilege level 10 is granted access to commands allowed at privilege levels 0 through 10 (if also defined). A privilege-level-10 user cannot access commands granted to privilege level 11 (or higher). A user authorized for privilege level 15 can execute all Cisco IOS commands.
Hope I could answer your question.
Source: Cisco.com