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spier

[ spahy-er ]
/ ˈspaɪ ər /
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noun
a person who spies, watches, or discovers.
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Which of the following nouns has an irregular plural form?

Origin of spier

Middle English word dating back to 1225–75; see origin at spy, -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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