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expert

In a sentence
Tom povedal, že nie je odborník.
Tom said he's no expert.
Ty si odborník.
You're the expert.
Vy ste odborník.
You're the expert.
Spýtajte sa odborníka.
Ask an expert.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.