dilettante; person with unusual hobbies
Often carries a slightly negative or eccentric nuance, suggesting someone who dabbles in odd or esoteric interests rather than a serious expert.
He's a dilettante who collects old cameras.
connoisseur; person of refined taste
A more positive sense, referring to someone with deep, cultivated appreciation in arts or culture. Less common than the dilettante sense in modern usage.
He is known as a connoisseur and an expert on tea utensils.
The kanji literally mean 'good-thing person', but the reading こうずか is irregular and its historical derivation is uncertain.