The term 'SEE 18-DOWN' is an instruction to look at the answer to the 18th down clue in the crossword. The solutions to the clues are INTO (4 letters), PAR (3 letters), ACID (4 letters), CAMP (4 letters), LORN (4 letters), NEXT (4 letters), TOED (4 letters), WINE (4 letters), JAMES (5 letters), MINEO (5 letters), TAXES (5 letters), WAFER (5 letters), NUMBER (6 letters), TREBEK (6 letters), NEXTYEAR (8 letters), and WONDERFUL (9 letters). These words are all nouns, verbs, adjectives, or adverbs that can be used to fill in the blanks of a crossword puzzle.