connoisseur

noun

1. A specialist in a given field whose opinion is highly valued, especially in one of the fine arts or in matters of taste.

   “beer connoisseur”

   “chocolate connoisseur”

   “wine connoisseur”

   “It is evident, in spite of his frequent attention to her while she draws, that in fact he knows nothing of the matter. He admires as a lover, not as a connoisseur.”

   “No; nonsense, Naumann! English ladies are not at everybody’s service as models. And you want to express too much with your painting. You would only have made a better or worse portrait with a background which every connoisseur would give a different reason for or against.”