PRACTITIONER
practitioner, practician
(noun) someone who practices a learned profession
Source: WordNet® 3.1
Etymology
Noun
practitioner (plural practitioners)
A person who practices a profession or art, especially law or medicine.
One who does anything customarily or habitually.
(dated) A sly or artful person.
Source: Wiktionary
Prac*ti"tion*er, n. Etym: [From Practician.]
1. One who is engaged in the actual use or exercise of any art or
profession, particularly that of law or medicine. Crabbe.
2. One who does anything customarily or habitually.
3. A sly or artful person. Whitgift. General practitioner. See under
General, 2.
Source: Webster’s Unabridged Dictionary 1913 Edition