Superscript :: Superscribe (v. t.) To write or engrave (a name, address, inscription, or the like) on the top or surface; to write a name, address, or the like, on the outside or cover of (anything); as, to superscribe a letter..
Superscription :: Superscription (n.) That which is written or engraved on the surface, outside, or above something else; specifically, an address on a letter, envelope, or the like..