Definition of words that are spelled the same forward and backward?

A palindrome:

The Word palindrome is from the Greek palíndromos, meaning running back again (palín = AGAIN + drom-, drameîn = RUN). A palindrome is a Word or phrase which reads the same in both directions.

Some simple examples are:

RACECAR DEED LEVEL PIP ROTOR CIVIC POP MADAM EYE NUN RADAR TOOT HANNAH (STANLEY YELNATS) BOOB TIT

The longest single English Word in common usage which is a palindrome is REDIVIDER, although the contrived chemical term DETARTRATED is two letters longer.

A heteronym that is spelt the same as another Word both forward and backwards