When I read Dmitri Borgmann's article on 100-letter tautonymic word squares in the November 1973 Word Ways, it was with elation (amidst some rather queasy emotions) that I realized "word" had taken on a new meaning. Now that multiple-word phrases have been accepted as "words", the building of tautonymic word squares is child's play. Hence, with childish delight I set about to whip up a couple of examples.
Youngquist, Mary J.
"Two Superb 144-Letter Word Squares,"
Word Ways: Vol. 7
, Article 11.
Available at: http://digitalcommons.butler.edu/wordways/vol7/iss1/11