A person who understands what other people want can be referred to as empathetic or perceptive. They often possess strong emotional intelligence, allowing them to read social cues and respond to the needs and desires of others effectively. This skill can be valuable in various contexts, including personal relationships, leadership, and customer service.
A person who understands everything is often referred to as omniscient or all-knowing.
A person who speaks and understands many languages can be called a polyglot.
Smart
hero
hypnotist
@ssh0le.
The technical term is an aerowaiter. My answer that everyone understands in an airhostess or steward.
a plagiarist
A person who tortures and gets enjoyment out of it is called a sadist.
A namesake, if one person was named for the other.
An examiner is one who tests others.
A Medium