the.com/jokester

means A person who habitually makes jokes or plays pranks, especially one who can't resist cracking wise.

from Straightforward English carpentry: 'joke' (from Latin 'iocus,' meaning jest or play) plus the agent suffix '-ster,' which once marked a doer of an action — seen in 'trickster,' 'gamester,' 'rhymester.' '-ster' originally signaled a female agent in Old English, but by the time it attached itself to 'joke' it had become a general, slightly informal tag for 'one who does this a lot.' So a jokester is, by its very bones, simply 'one who jokes' — habitually, maybe professionally.