There are exhaustive lists at the related links below.
There are also lists of palindromes that are the same word spelled forward or backward. Reversed words and phrases would come under the general term "anagrams", which includes and words formed by re-ordering all the letters in a word or phrase.
One word for these words is semordnilaps (semordnilap is palindrome spelled backward). Examples are was/saw, liar/rail, diaper/repaid, and desserts/stressed.
Some other suggested names for the words :
On the Lighter Side
Some reversals are particularly apt : the phrase STRAP ON is NO PARTS backwards.
live and evil
cat and tac
nut and tun
dad spell dad backwards dad see?
stress, dress, rest, Stressed spelled backwards is desserts!
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)
The word 'semordnilap' is a name for a word that makes another word when read backwards. 'Semordnilap' is 'palindromes' itself when read backwards. While palindromes are words that spell the same backwards (like radar, racecar), semordnilaps are reverse anagrams, words that spell different words when they are spelled backward, such as liar/rail, diaper/repaid, desserts/stressed. (see related link for a list)
Words that are spelled the same forward and backward are called "palindromes", including such words as noon, radar, racecar, and redder. Words that spell different words when spelled backward are variously known as semodnilaps, heteropalindromes, and anadromes. They include such word pairs as stressed/desserts, deliver/reviled, and diaper/repaid. (see related links for lists)
Palindrome
anadrome
Palindromes
palindromes
You can find a dictionary of words spelled backwards in a reverse dictionary or by using online tools that offer this functionality. Websites like reversespelling.com or wordfind.com provide options to search for words spelled backwards.
Anadrome
Words that are spelled the same backwards and forwards, like "level."