They're called palindromes.
palindromes
A Palindrome.
An anadrome.
They are called palindromes.
Palindromes.
Palindromes.
HI: A palindrome.
palindrome
Palindromes
palindromes
palindromes
A Palindrome.
palindromes
palindromes
An anadrome.
One common term is semordnilap (the word palindrome spelled backwards).Palindromes, like radar and racecar, spell the same word forward or backward. Semordnilaps are different real words when spelled backwards, such as was/saw, liar/rail, diaper/repaid, and desserts/stressed.Other terms for these words are opisograms, or reverse anagrams.(see related link)
Words that spell a different word when spelled backwards are called anagrams.