Annex, briefly, 4 letters
Annex, for instance: Abbr., 4 letters
Annex: Abbr., 4 letters
Arith. chore, 4 letters
Arith. process, 4 letters
Bldg. annex, 4 letters
Codicil, e.g., 4 letters
Something appended: Abbr., 4 letters
Supplement (abbr.), 4 letters
Wing: Abbr., 4 letters
Extra (abbr.), 5 letters
Extra, briefly, 5 letters
... TAN XMEN, MINX AND MATCH, and PEPSI MANX, 7 letters