Shouldn't a word square be a square array of words rather than a square array of letters? In "Magic Square Magic" in the May 2002 Word Ways, Jeremiah Farrell presented a word square in the former sense. Its novelty may have escaped the casual reader since it was presented as part of a "magic" trick; here the focus is on the square itself, with a challenge for the reader.
Eckler, A. Ross
"A True Word Square,"
Word Ways: Vol. 36
, Article 21.
Available at: https://digitalcommons.butler.edu/wordways/vol36/iss2/21