What is it called when a word has different read backwards?

There isn't a specific term for a word that reads differently backwards. However, depending on the specific characteristic you're interested in, there are a few terms that might apply:

* Palindrome: A word that reads the same forwards and backwards, like "racecar" or "level".

* Semordnilap: A word that spells another word backwards, like "stressed" and "desserts" or "drawer" and "reward".

* Anagram: A word or phrase formed by rearranging the letters of another word or phrase, like "listen" and "silent".

If you're looking for a more general term, you could say "a word with a different backward spelling" or "a word that is not a palindrome".