Origin: Greek suffix -ist
Orthoepist has 2 different meanings across 1 category:
a practitioner of orthoepy (especially one of the 17th or 18th century scholars who proposed to reform English spelling so it would reflect pronunciation more closely)
An expert at orthoepy: a person who studies the pronunciation of words, especially (historical) one of the orthoepists, 16th- and 17th-century linguists who tried to establish standard English pronunciations and spellings.