Simpleton and Show-off

Simpleton noun - A person who lacks good sense or judgment.

Show-off and simpleton are semantically related In some cases you can use "Show-off" instead a noun "Simpleton".

Show-off noun - Someone who deliberately behaves in such a way as to attract attention.

Simpleton and show-off are semantically related in person who is wildly funny topic. Sometimes you can use "Simpleton" instead a noun phrase "Show-off".