connoisseur

(ˌkɒnɪˈsɜː )

noun

a person with special knowledge or appreciation of a field, esp in the arts

Collins English Dictionary. Copyright © HarperCollins Publishers

Derived forms

connoisseurship (ˌconnoisˈseurship)

 noun

Word origin

C18: from French, from Old French conoiseor, from connoistre to know, from Latin cognōscere

https://www.collinsdictionary.com/dictionary/english/connoisseur