This is a list of candidates for the longest English word of one syllable, i.e. monosyllables with the most letters. A list of 9,123 English monosyllables published in 1957 includes three ten - letter words: scraunched, scroonched, and squirreled. Guinness World Records lists scraunched and strengthed. Other sources include words as long or longer. Some candidates are questionable on grounds of spelling, pronunciation, or status as obsolete, dialect, proper noun, loanword, or nonce word.
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Proper names
Some nine-letter proper names remain monosyllabic when adding a tenth letter and apostrophe to form the possessive:
It is productive in English to convert a (proper) noun into an eponymous verb or adjective:
Contrived endings
In a 1970 article in Word Ways, Ralph G. Beaman converts past participles ending -ed into nouns, allowing regular plurals with -s. He lists five verbs in Webster's Third International generating 10-letter monosyllables scratcheds, screecheds, scroungeds, squelcheds, stretcheds; from the verb strength in Webster's Second International he forms the 11-letter strengtheds.
The past tense ending -ed and the archaic second person singular ending -st can be combined into -edst; for example "In the day when I cried thou answeredst me, and strengthenedst me with strength in my soul" (Psalms 138:3). While this ending is usually pronounced as a separate syllable from the verb stem, it may be abbreviated -'dst to indicate elision. Attested examples include scratch'dst and stretch'dst, each of which has one syllable spelled with ten letters plus apostrophe.
Onomatopoeia
Onomatopoeiac monosyllables may be extended without limit to represent a long drawn-out sound or utterance. For example, Yann Martel's 1995 novel Self includes a 45-letter Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh and a 35-letter Ooooooooooooooooooooooooooooooooooh.