A selection of challenging words from the National Spelling Bee:
Aquiclude: A geological formation confining water.
Bourree: Small crossing steps in ballet.
Capitatim: Levied at so much per head.
Erethic: Producing abnormal irritability.
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Lallation: Defective articulation of the letter "l."
Minnelied: A certain song with love as its subject.
Pergameneous: Resembling parchment.
Sarrusophone: A type of musical instrument.
Telmatology: The study of wetlands.