boaster, braggadocio, braggart, egotist, exhibitionist, hot dog (chiefly U.S.) peacock, poseur, swaggerer
English Collins Dictionary - English synonyms & Thesaurus
show-off ( show-offs plural ) , showoff If you say that someone is a show-off, you are criticizing them for trying to impress people by showing in a very obvious way what they can do or what they own.
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