Angered and enraged, e.g. (8)
I believe the answer is:
anagrams
(Other definitions for anagrams that I've seen before include "Words made by rearranging the letters of others" , "Word jumbles" , "Words formed from letters of other words" , "Mixed-up words as ragman have it" , ""Sword" from "words" and "seraph" from "phrase", for example" .)