sails / sales 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. 👇
sails: (noun) a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel. (noun) any structure that resembles a sail. (verb) traverse or travel on (a body of water). (verb) travel on water propelled by wind.
sales: NA
sails: s·EY·l·z
sales: s·EY·l·z
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)