strider / stridor 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. 👇
strider: (noun) a person who walks rapidly with long steps.
stridor: (noun) a whistling sound when breathing (usually heard on inspiration); indicates obstruction of the trachea or larynx.
strider: s·t·r·AY·d·er
stridor: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)