Reasoner (noun)

1. A person who reasons or uses logical thinking.
2. A person who uses reasoning to arrive at a conclusion.

Origin:

The word reasoner is formed from the word "reason" which means to think about something in a logical way. a reasoner is a person who reasons or uses logical thinking.

Examples:

1. He is a clear and logical reasoner.
2. The lawyer was a skilled reasoner and was able to win the case.
3. The scientist was a careful reasoner and always considered all the evidence.
4. The philosopher was a deep reasoner and could think about complex ideas.
5. The detective was a skilled reasoner and was able to solve the crime.