Anagramming -- the transformation of one word into another by rearrangement of its letters -- is one of the oldest forms of word play, dating back hundreds of years. It is somewhat surprising that no one has attempted a systematic classification of anagrams.
Eckler, A. Ross
"An Anagram Classification System,"
Word Ways: Vol. 3
, Article 9.
Available at: https://digitalcommons.butler.edu/wordways/vol3/iss1/9