There are 13 23-letter words in our merged US + UK English word list.
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carboxymethylcelluloses
deinstitutionalizations
dichlorodifluoromethane
electroencephalographer
electroencephalographic
hexamethylenetetramines
indistinguishablenesses
intersubstitutabilities
microspectrophotometers
microspectrophotometric
nonrepresentationalisms
overintellectualization
reinstitutionalizations
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