Cognoscente (noun)

1. An expert in a particular field or aspect of knowledge; a connoisseur.
2. A person who is well-informed or well-educated about a particular subject.

Origin:

From the italian word "cognoscente", meaning "one who knows".

Examples:

1. As a cognoscente of fine art, he had a keen eye for detail and quality.
2. She was a cognoscente of literature and could discuss the works of the great authors with ease.
3. The wine tasting was led by a cognoscente of the region's wines.
4. He was a cognoscente of music and could play several instruments with great skill.
5. The museum's tour guide was a true cognoscente of the artworks on display.