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nitpicker

or nit-pick·er

[nit-pik-er]
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noun
  1. a person who nitpicks, especially habitually.
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Origin of nitpicker

First recorded in 1950–55; nit1 + pick1 + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for nitpicker

n.

"pedantic critic," 1951; see nit (n.) + pick (v.).

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Online Etymology Dictionary, © 2010 Douglas Harper