Nouns

(n)joker, jokestera person who enjoys telling or playing jokes
(n)joker, turkeya person who does something thoughtless or annoying“some joker is blocking the driveway”
(n)jokeran inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent“when I demanded my money he showed me the joker in the contract”
(n)jokera playing card that is usually printed with a picture of a jester