connoisseur
🇺🇸
/ˌkɑːnəˈsɜːr/
🇬🇧
/ˌkɒnəˈsɜː(r)/
A person who has a deep knowledge and appreciation of a particular subject, such as art, food, or music.
As a wine connoisseur, she could tell the difference between a good bottle and a great one.