This suffix indicates the person who performs the action of praying.
Here are a few other less common suffixes you might encounter:
* -ing: praying (present participle)
* -ed: prayed (past tense or past participle)
* -ful: prayerful (full of prayer or devotion)
While these suffixes are used with the root word "pray," they don't technically form new words but rather grammatical variations.