Aficionado (noun)

A person who is very knowledgeable and enthusiastic about a particular subject or activity.

Origin:

Spanish, from aficionado, past participle of aficionar to devote oneself to, from afición affection, from latin affectiō.

Examples:

1. She is an aficionado of fine art.
2. He is an aficionado of classical music.
3. He is a wine aficionado and has a large collection.
4. He is an aficionado of jazz music.
5. She is a fashion aficionado and always keeps up with the latest trends.