What word when read from backwards yields another word?

When a letter reads the same when read from either side, it is palindrome. If the letters of a word are rearranged to give a new word, it is anagram. What if it is a new word when read from backwards? Is there a name for it? Or, is called anagram too. E.g. Diaper-Repaid; Mood-Doom; Lever-Revel;Mart-Tram;Pan-Nap;Reel-Leer;… etc.