A good synonym for the phrase "to reveal a secret" would be the word surprise, as a verb. As a verb, surprise means to cause someone astonishment or shock.
My traditional cheesecake recipe has been a secret but I will reveal the recipe on one condition.
The secret word for Hot Sand Part 1 is Hot Coffee. This secret word will reveal what happened to Stella Liebeck.
Reveal?
secret,
re·vealtr.v., -vealed, -veal·ing, -veals.To make known (something concealed or secret): revealed a confidence.To bring to view; show.Above retrieved from Answers.com Viper1
Himitsu is secret秘密
Examples of seven letter synonyms for the verb to reveal are:confessdeclaredivulgeexplainpublishpresentprofessuncover
to make known, to reveal something like a secret - are two definitions for you.
word choice
In To Kill a Mockingbird what secret does Jem reveal to Scout?
Sub rosa, meaning "under the rose."
Spy.