sou / sue 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. 👇
sou: (noun) a former French coin of low denomination; often used of any small amount of money.
sue: (noun) French writer whose novels described the sordid side of city life (1804-1857).
sou: NA
sue: s·UW
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)