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"expert" is also used as a crossword clue. If that's what you saw, the answer is often wiz (3 letters).
Definitions
having or showing knowledge and skill and aptitude
Word origin
Inherited from Middle English expert, derived from Old French expert (“experienced”), espert, from Latin expertus (contracted from *experitus), perfect active participle of experior (“to try”), from ex- + *-perior.
Used in a sentence
“I am expert at making a simple situation complex.”
“My cousin is an expert pianist.”
“This problem requires expert knowledge.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Highly skilled person”6 letters
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