show-off
noun
- act of showing off
- one who shows off
Wiktionary
noun
Etymology: A deverbal from show off.
- One who shows off; a person given to egotistically demonstrating their prowess or ability.
“Quit being such a show-off, before someone gets hurt.”
““Don’t tell me what to do, you double-crossing little show-off!” he grated. “Here, stand aside there, and let a man pass.””