nitpick - definition and synonyms

verb [intransitive/transitive] 

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/ˈnɪtˌpɪk/
present tense
I/you/we/theynitpick
he/she/itnitpicks
present participlenitpicking
past tensenitpicked
past participlenitpicked

derived word

nitpicker

noun [countable]
singularnitpicker
pluralnitpickers