shore / sure 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. 👇
shore: (noun) the land along the edge of a body of water. (noun) a beam or timber that is propped against a structure to provide support. (verb) serve as a shore to.
sure: (adjective) physically secure or dependable. (adjective) (of persons) worthy of trust or confidence. (adjective) infallible or unfailing. (adjective) certain not to fail.
shore: sh·AO·r
sure: sh·UH·r
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)