The letters of some words can travel in a circle, like the whirling of juggled balls. Such words -- in which the first letter can be moved from frontword to backword to form another word -- have been labeled "cyclic transposals." I prefer the more straightforward term "looping anagrams."
"Super Duper Loopers,"
Word Ways: Vol. 31
, Article 4.
Available at: http://digitalcommons.butler.edu/wordways/vol31/iss2/4