A palindrome is a word, or set of words, that spells the same thing if you read if forward or backward. For example: noon, mom, kayak, level, and “step on no pets”.
However, there is no official name for a word that makes a different word when spelled backwards. For example: stop (pots); keep (peek); desserts (stressed); now, loop, reward
A 6 year old boy in Canada named Levi has suggested that we call those levidromes. Can you think of any other levidromes?