confession (to a crime, wrongdoing, etc.), admission, professing one's feelings (to someone one wants to go out with), declaration of love, profession (of faith), confession (of sins)
警告【けいこく】
warning, advice
忠告【ちゅうこく】
advice, warning
報告書【ほうこくしょ】
(written) report
告げる【つげる】
to tell, to inform, to announce, to indicate, to signal, to mark