connoisseur
Definitions
An expert judge in matters of taste, especially in the fine arts or cuisine.
A person who has a great deal of knowledge about or appreciation for a particular field.
Examples
As a true connoisseur of fine wines, he could identify the vintage after just one sip.
The gallery owner is a connoisseur of modern art who has spent decades curating her collection.
She is a connoisseur of classical music and rarely misses a performance by the local symphony.