15 letters Fancy-schmancy language ... or the contents of some special squares in this puzzle Answer: FIVEDOLLARWORDS
15 letters Command center? ... or where you might hear the starts of 17-, 28- and 49-Across Answer: OBEDIENCESCHOOL
15 letters Misfit ... or what you get after the sequence described by the ends of 17-, 21-, 57- and 63-Across? Answer: AFISHOUTOFWATER