“Semordnilap” is a word playfully coined by word-game lovers some time in the mid 20th century. While a palindrome reads the same way backwards or forwards (otto, kayak), a semordnilap (itself a semordnilap of “palindromes”) makes a completely different word when spelled backwards. While there are some semordnilaps that arose by chance (desserts-stressed, diaper-repaid), there are many, like “semordnilap,” that were created on purpose, usually to not-so-covertly hint at the words they happen to be reversing. Here are 9 words, besides semordnilap, expressly built to be semordnilaps.
Source:
9 Words Created by Spelling Other Words Backwards | Mental Floss
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