Most of us are familiar with words like HORSESHOER in which the letters making the first half of the word are transposed to make the second half of the word. The following examples can all be found in previous issues of Word Ways, and most recently appeared amongst Rex Gooch's list of pair isograms in the February 1998 issue.
"Split Sentence Transposals,"
Word Ways: Vol. 32
, Article 21.
Available at: http://digitalcommons.butler.edu/wordways/vol32/iss4/21