Word formed by rearranging the letters of another (7)
I believe the answer is:
anagram
(Other definitions for anagram that I've seen before include "Scramble of letters (to make trestle, perhaps)" , "Jumbling of letters" , "Word formed by changing the order of letters in another" , "Rearrangement of letters in word or phrase to form another" , "There's confusion among characters" .)