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spe•cial•ist
n.
1.One who is devoted to a particular occupation or branch of study or research: “Specialists... tend to think in grooves” (Elaine Morgan).
2.A physician whose practice is limited to a particular branch of medicine or surgery, especially one who is certified by a board of physicians: a specialist in oncology.
3.Any of several noncommissioned ranks in the U.S. Army that correspond to that of corporal through sergeant first class.
gen•er•al•ist
n. One who has broad general knowledge and skills in several areas.