Darryl Francis's article New Pair Isograms in the February 2012 Word Ways brought back memories from my early days of dabbling with word play. After discovering the beautiful symmetry of words like HORSESHOER and INTESTINES in Language on Vacation (Dmitri Borgmann, 1965), I spend many hours scouring the Oxford English Dictionary for new examples. Imagine my elation on finding CHARACTERETH and INACCIDENTATED.
"Long Pair Isograms,"
3, Article 16.
Available at: http://digitalcommons.butler.edu/wordways/vol45/iss3/16