rosary / rosery 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. 👇
rosary: (noun) a string of beads used in counting prayers (especially by Catholics).
rosery: NA
rosary: r·OW·z·er·iy
rosery: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)