10-Letter Palindromes
Genuine 10-letter single-word palindromes are essentially nonexistent in standard English — there is no widely recognised dictionary word exactly 10 letters long that reads the same both ways.
Where to look instead
Palindrome words tend to cluster at odd lengths. For examples near 10 letters, the richest pools are seven-letter words like racecar and deified and nine-letter words like malayalam and rotavator. For the record-breakers — including the 12-letter tattarrattat — see the longest palindromes.