The Oxford Dictionary posts an article on their blog titled "You say 'Super Bowl', I Say 'Superb Owl': what is the name for this wordplay?"
In the article Lauren Holden from Yorkshire, England, mentioned "In fact, Oxford Dictionaries' lexicographers are currently tracking use of 'levidrome', a word that was coined by a young Canadian boy last year after realizing there is no name for words that form differently when read forwards and backwards (unlike a palindrome)."