nitpicker

or nit-pick·er

[nit-pik-er]

noun

a person who nitpicks, especially habitually.

Origin of nitpicker

First recorded in 1950–55; nit1 + pick1 + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


Word Origin and History for nitpicker
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper