shoe / shoo 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. 👇
shoe: (noun) footwear shaped to fit the foot (below the ankle) with a flexible upper of leather or plastic and a sole and heel of heavier material. (noun) (card games) a case from which playing cards are dealt one at a time. (verb) furnish with shoes.
shoo: NA
shoe: sh·UW
shoo: sh·UW
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)