1. Defining three types of words By definition, a palindrome is a word, phrase or sentence that reads the same in the reverse direction as in the forward one. Simple examples of four letter English palindromes include SEES and DEED, but a moment's reflection reveals there is a fundamental difference between these two words.
"On the Distinction Between "Phonetic" Palindromes and "Phonetically" Reversible Words,"
Word Ways: Vol. 44
, Article 16.
Available at: http://digitalcommons.butler.edu/wordways/vol44/iss4/16