worst / wurst are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
worst: (noun) the least favorable outcome. (noun) the greatest damage or wickedness of which one is capable. (noun) the weakest effort or poorest achievement one is capable of. (verb) defeat thoroughly. (adjective) (superlative of `bad') most wanting in quality or value or condition. (adverb) to the highest degree of inferiority or badness.
wurst: NA
worst: w·ER·s·t
wurst: w·ER·s·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)