prier / prior 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. 👇
prier: NA
prior: (noun) the head of a religious order; in an abbey the prior is next below the abbot.
prier: p·r·AY·er
prior: p·r·AY·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)