This article is a continuation of "Word Arithmetic" from the November Word Ways. Dmitri Borgmann is Beyond Language gave the four-letter absolute difference word FORM = 6 15 18 13 becomes 9 3 5 ICE. In "Difference Words" in the August 1971 Word Ways, Ross Eckler found in Webster's Collegiate 15 five-letter words such as SAFER and CHILD and three six-letter words from elsewhere: ELDEST, RETAIN, FRITOS. In "Difference Words Ride Again" in the August 1975 issue, Tom Pulliam added 10 more six-letter words from Webster's Unabridged, Second and Third editions.
"Absolute Difference Words,"
Word Ways: Vol. 30
, Article 13.
Available at: http://digitalcommons.butler.edu/wordways/vol30/iss1/13