pedant
[noun]
Synonyms: hairsplitter, nit-picker (informal), quibbler

[TahlilGaran] English Synonym Dictionary ▲

ped‧ant /ˈpednt/ noun [countable]
[Date: 1500-1600; Language: French; Origin: pédant, from Italian pedante, perhaps from Latin paedagogus; ⇒ pedagogy]
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.’
—pedantry noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲