say it: JOH-kur
joker is a noun meaning "a person who enjoys telling or playing jokes". It carries 4 recorded senses.
a person who does something thoughtless or annoying
“some joker is blocking the driveway”
an 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”
a playing card that is usually printed with a picture of a jester
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for joker come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.