IPA: /rɪˈviːlər/
KK: /rɪˈviːlər/
A person or thing that makes something known or visible that was previously hidden or unknown.
The detective was a revealer of secrets, uncovering truths that others wanted to keep hidden.
Revealer → It is formed from "re-" (meaning again) and "velare" (meaning to uncover or unveil). The word "revealer" refers to someone who uncovers or makes something known again.
Think of someone who 'uncovers' ('velare') something 'again' ('re-') — that's why a revealer is someone who reveals or makes something known.