In lang=en terms the difference between discuss and reveal
is that
discuss is to converse or debate concerning a particular topic while
reveal is to communicate that which could not be known or discovered without divine or supernatural instruction.
In obsolete|lang=en terms the difference between discuss and reveal
is that
discuss is (obsolete) to communicate, tell, or disclose (information, a message, etc) while
reveal is (obsolete) the side of an opening for a window, doorway, or the like, between the door frame or window frame and the outer surface of the wall; or, where the opening is not filled with a door, etc, the whole thickness of the wall; the jamb.
As verbs the difference between discuss and reveal
is that
discuss is (obsolete|transitive) to drive away, disperse, shake off; said especially of tumors while
reveal is to uncover; to show and display that which was hidden.
As a noun reveal is
the outer side of a window or door frame; the jamb.