I assume you mean in the English language. The first one that came to mind was "scratched", with nine letters. That made me think of "scrunched"--which I think is a real word, also nine letters. I seem to be stuck in the letter "S" as the only others I can think of right now with nine letters are "stretched" and "scrounged." I can't think of any words of one syllable with more than nine letters.
It sounds like LoisRyan and JayWisdom agree that a word is one syllable if it is pronounced in one syllable, even if, in spelling, it has two syllables, as the "ed" at the end would be a second syllable, orthographically.
Following those rules, I would add screeched as another 9-letter example.
And thank, I'd always wondered how brougham was pronounced.
Might there be some English geographic place names with long spellings and short pronunciations?
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