sachet / sashay 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. 👇
sachet: (noun) a small soft bag containing perfumed powder; used to perfume items in a drawer or chest.
sashay: (noun) a square dance figure; partners circle each other taking sideways steps.
sachet: s·ae·sh·EY
sashay: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)