pédant, from Italian pedante, perhaps from Latin paedagogus; PEDAGOGY
pedant
noun
ped‧ant [countable]
someone who pays too much attention to rules or to small unimportant details, especially someone who criticizes other people in an extremely annoying way:
'That's not exactly what it means.' 'Pedant.'
—pedantrynoun [uncountable]
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.