connoisseur
n.someone who has a very good knowledge of a specific subject, especially something like food, wine, or art. You use this to describe a person who can tell the difference between high-quality and cheap versions of a product.
n.a person with extensive knowledge or experience in a particular field, especially one involving aesthetic or sensory appreciation. Often implies a level of expertise that allows for the discernment of subtle quality differences.
“A true connoisseur can tell the difference between two types of wine.”
“The restaurant's menu is designed for a connoisseur of rare cheeses, featuring varieties from across Europe.”
“While the general public may prefer mass-produced goods for their convenience, a connoisseur seeks out artisanal craftsmanship and the unique characteristics that define a specific batch or vintage.”
“A wine connoisseur, he was wine-buyer for Edinburgh University’s staff club for many years.”
“No self-respecting sophisticate admits to being shocked, of course, and no horror connoisseur will admit to being really and truly horrified.”
Around 1705–1715, from French connoisseur, from the verb connoître (obsolete pre-1835 spelling of connaître (“to know”)).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.