Japer
Japer may refer to several things. In common English usage, "japer" is a noun meaning one who japes, or a person who jokes or plays pranks. This usage is relatively uncommon today, with "jokester" or "prankster" being more frequent terms.
Historically, "japer" has also been used as a surname. Notable individuals with this surname include John Japer,
In a more technical or specialized context, "japer" could potentially arise as a portmanteau or a neologism