NCOs serving in the top three enlisted grades (E-7, E-8, and E-9) are termed senior non-commissioned officers (Chief Petty Officers in the Navy and Coast Guard).
In the US Army :
E-7 Sergeant First Class
E-8 Master Sergeant/First Sergeant
E-9 Sergeant Major/Command Sergeant Major
However with the above listed names it is the regulations which states (with exception to First Sergeant and Sergeant Major/Command Sergeant Major) that they are to be address as Sergeant.
Therefore a:
E-5 is addressed as Sergeant
E-6 is addressed as Sergeant
E-7 is addressed as Sergeant
E-8 Master Sergeant is addressed as Sergeant
E-8 First Sergeant is addressed as 1SG or First Sergeant
E-9 Sergeants Major is addressed as Sergeants Major
E-9 Command Sergeant Major is addressed as Sergeant Major though out of respect it is not uncommon to hear them addressed as Command Sergeants Major.
If by "rate" you actually mean "evaluate their performance" - yes, it may be possible - especially if the junior NCO has some particular expertise in a certain field that the senior NCO does not. In that case the TECHNICAL proficiency of the senior NCO's ability to perfom the task can be evaluated by the junior NCO, but nothing else.
Unit CSM or Senior NCO
He is a senior NCO.
by any senior who has given the exam
senior NCO
senior nco
Simply put, the seniormost NCO amongst a group of instructors.
Senior NCO
Senior NCO
In the US Air Force a NCO is a non-commissioned officer. This title carries the name Sergeant in it somewhere like Staff Sergeant, Senior Master Sergeant. The rank currently starts with the E-5 level. The levels below the E-5 carry the title Airmen in the name. During the Vietnam War E-4 was considered a NCO with just the title of Sergeant. After the War the Sergeant level moved to level E-5 and above. E-4 level was renamed Senior Airman.
A senior NCO gets a warrant, the means differs in most armed forces.
senior NCO