Emordnilap! It's palindrome, backward. A palindrome is a word or phrase that reads the same whether you spell it forwards or backwards. Kayak, madam, racecar, rotor, and refer are some examples. And we have more! Emordnilaps, or semordnilap if you're really into doing things backward, are words that become other words when spelled backward. Also called levidromes, anadromes, reverse pairs and plain backwards words, emordnilaps are a fun oddity of the English language.
Emordnilaps are palindromes' mirror images and/or evil twins, rare words that become different words when spelled backward! Reverse the word "stop" and it becomes "pots." Flip "drawer" and you get "reward." English contains a wide variety of words that change meanings as soon as you read them right to left.
Don't tell your English teacher or spell check algorithm we said this, but...better whisper:
There's no such thing as a "real" word. If you can pronounce it and it means something that other people understand, it's real. That's what words are. The concept of a "made-up word" is silly. All words are made-up words.
OK. We don't think we're going to get raided by the Literal Grammar Police. That said, both emordnilap and levidrome haven't made it into big dictionaries yet. Both are of relatively recent origin: emordnilap dates to 1961, and levidrome takes its name from its creator, the formidable young grammarian Levi Budd, who as of 2019 is 8 years old.
"Emordnilap" and "levidrome" aren't real words in the sense of being adopted into dictionaries, but they absolutely are real words in the sense of beginning to enter common usage.
For more, check out the authoritative Levidrome List.
Behold the wacky word wonder that is the emordnilap. Is it important? Not really. For practical purposes, well… emordnilaps (or semordnilap, if you prefer) have no practical purposes. Neither do palindromes, for that matter. Nor do limericks, fridge poetry, cryptic crosswords or chatty dictionary articles. What those things have in common is a delight in the oddities of the English language. Emordnilaps are absolutely among those oddities.
Whether you call them reverse pairs, levidromes, anadromes or just backward words, they're a way to celebrate the unique, frankly weird patchwork that is our shared tongue. For more beautiful English weirdness, check out our funny oxymorons and malapropisms!