For the benefit of new readers, allow me to explain the terms heterogram and alphome. Heterogram is my preferred term for isogram, a word such as AMBIDEXTROUS in which no letter is repeated. In "Alphomes" in the November 1995 Word Ways, I defined an alphome as follows: a set of alphabetically-ordered letters of which at least one arrangement is a word. Thus the alphome ABINR makes the word BRAIN.
"Heterograms and Their Alphomes,"
Word Ways: Vol. 31
, Article 5.
Available at: http://digitalcommons.butler.edu/wordways/vol31/iss3/5