orator; eloquent speaker
Refers to a person skilled in public speaking, often with persuasive power. Neutral register; can be used in both formal and everyday contexts.
He is a born orator.
The politician is known as an outstanding eloquent speaker.
話し手 simply means 'speaker' without the connotation of eloquence. 雄弁家 implies exceptional speaking ability.
Compound of 雄弁 (eloquence) + 家 (person who does something). 雄弁 itself is from 雄 (male, heroic) and 弁 (speech).