IPA: /ˈrɪtʃ.u.əl.ɪst/
KK: /ˈrɪtʃuəlɪst/
A person who studies or practices rituals, often in a religious or cultural context.
The ritualist led the ceremony with great respect and knowledge of the traditions.
Ritualist → It is formed from "ritual" (from Latin *ritualis*, meaning relating to rites) and "-ist" (meaning one who practices or is concerned with). A ritualist is someone who practices or is concerned with rituals.
Think of someone who is deeply involved in 'rites' ('ritual') and is a person who practices them ('-ist'). This helps you remember that a ritualist is someone who engages in rituals.