There are 30 22-letter words in our merged US + UK English word list.
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carboxymethylcellulose
constitutionalizations
countercountermeasures
counterinterpretations
counterrevolutionaries
deinstitutionalization
disestablishmentarians
electroencephalographs
electroencephalography
electrophysiologically
encephalomyocarditises
establishmentarianisms
hexamethylenetetramine
immunohistochemistries
incomprehensiblenesses
indistinguishabilities
intercomprehensibility
keratoconjunctivitides
keratoconjunctivitises
microspectrophotometer
microspectrophotometry
nonrepresentationalism
otorhinolaryngological
otorhinolaryngologists
overcommercializations
philoprogenitivenesses
phosphoglyceraldehydes
reinstitutionalization
spectrophotometrically
unrepresentativenesses
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