Palindroming is such an unnatural occupation that it is extremely hard to make an intelligible pal of length, or even a short one involving diphthongs, especially if H is involved. (No, no, the letter, not the drug. But I imagine heroin would make it totally impossible, if not uninteresting.) Hence most pals require and ideally requite explanation, as few make easy reading, unlike anagrams which are much easier. With that excuse, I present some more or less identical palls that include and define the word palindrome itself in a new way, so far as I know.
Word Ways: Vol. 43
, Article 23.
Available at: http://digitalcommons.butler.edu/wordways/vol43/iss2/23