coco / cocoa 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. 👇
coco: NA
cocoa: (noun) a beverage made from cocoa powder and milk and sugar; usually drunk hot. (noun) powder of ground roasted cacao beans with most of the fat removed.
coco: k·OW·k·OW
cocoa: k·OW·k·ow
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)