Definitions:

1. A person who performs and delivers jokes and jumorous stories, often in a professional context. NOUN
   • The gagster had the audience in stitches with his rapid-fire jokes.
2. A person, often a professional entertainer, who uses humor, joks, tricks, or stunts to amuse others, particularly in a comedic or performance setting. NOUN
   • The film's leading gagster was known for his ability to improvise hilarious lines on the spot.

Synonyms:

• comedian
• gagman
• humorist
• jokester
• stand-up comic