[n] a person who enjoys telling or playing jokes [n] a person who does something thoughtless or annoying; "some joker is blocking the driveway"
jokester, turkey
ace, actor, Adamite, artful dodge, Artful Dodger, artifice, astonishment, bad boy, bag of tricks, bamboozler, banana, bastard, befuddler, beguiler, being, best bower, bill, bird, blind, block, blockade, blockbuster, blow, bluff, body, bomb, bombshell, boo