A person who reveals or makes something known to the public, especially something that was previously secret.
From Latin divulgare (to publish widely) + -er (agent suffix). The Latin root combines dis- (apart) and vulgus (common people), literally meaning 'to make common.' The -er suffix was added in English to denote one who performs the action.
The word divulge sounds dramatic, but it literally means 'to make common'—it comes from the same root as 'vulgar,' which originally just meant 'of ordinary people' rather than being an insult. So a divulgater is basically someone who takes secret things and makes them ordinary knowledge.
Complete word intelligence in one call. Free tier — 50 lookups/day.