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willow oak

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noun
an oak, Quercus phellos, of the southwestern U.S., having entire, narrow leaves, yielding a hard, heavy wood used in the construction of buildings.
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Which of the following nouns has an irregular plural form?

Origin of willow oak

An Americanism dating back to 1700–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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