The term 'Confidential Warning' can be represented by two crossword solutions: PSST (4 letters) and TIPOFF (6 letters). PSST is an informal way of getting someone's attention, usually used when one wants to share a secret. TIPOFF is a warning or advance notice about something, often given in confidence. Together, these two words represent a confidential warning, which is a warning that is given in private and should not be shared with anyone else.