cache / cash 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. 👇
cache: (noun) a hidden storage space (for money or provisions or weapons). (noun) (computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristics.
cash: (noun) money in the form of bills or coins. (noun) prompt payment for goods or services in currency or by check. (noun) United States country music singer and songwriter (1932-2003). (verb) exchange for cash.
cache: k·AE·sh
cash: k·AE·sh
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)