The only 15-letter word that can be spelt without repeating a letter is uncopyrightable.
100 Mind-Blowing Spelt Facts
“OK” most likely stands for fake words. In the 1830s, people jokingly spelt abbreviations incorrectly. One of the most famous: “All correct” turned into “orl korrekt,” and then of course into OK. Historians think it stuck because Martin Van Buren—known as Old Kinderhook, after his hometown in New York—supporters called themselves the OK Club when he was campaigning for reelection.
No number before 1,000 contains the letter “A” when spelt out.
People started wearing pyjamas, originally spelt “pyjamas,” instead of nightgowns so they’d be prepared to run outside in public during World War I air raids in England.