psalter / salter 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. 👇
psalter: (noun) a collection of Psalms for liturgical use.
salter: (noun) someone who uses salt to preserve meat or fish or other foods. (noun) someone who makes or deals in salt.
psalter: s·AO·l·t·er
salter: s·AO·l·t·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)