Specialist

[Sarah]

One who devotes himself to some specialty; as, a medicalspecialist, one who devotes himself to diseases of particular partsof the body, as the eye, the ear, the nerves, etc.

[Sarah]

Somebody who excels in a certain field, above average. Also can mean just simply awesome.

[Sarah]

A rank in many modern militaries, especially the United States military, that is above private 1st class and below corporal (Army) in some instances.

[Sarah]

(n.) Someone who is special.

[Sarah]

Someone who is prejudiced against the mentally disadvantaged.
From [special needs].
Derived from [special] in the same way as [racist] and [sexist] are from
[race] and [sex].

[Dorothey Allen]

Specialist in Field Hockey. Until a recent rule change, this was a player who came on merely to hit short corners. This is no longer permissible in the rules.

[Couch Potatoe]

A person who concentrates primarily on a particular subject or activity; a person highly skilled in a specific and restricted field.