anagram (n.)

"transposition of letters in a word so as to form another; a word so formed," 1580s, from French anagramme or Modern Latin anagramma (16c.), both from Greek anagrammatizein "transpose letters of a word so as to form another," from ana "back, backwards" (see ana-) + gramma (genitive grammatos) "letter" (see -gram). Evil is an anagram of live. Related: Anagrammatic; anagrammatical; anagrammatically.