a know-all

(British & Australian) also a know-it-all (American & Australian)

someone who seems to know everything and annoys other people by showing how clever they are No one likes him because he's such a know-all.

Name	Pronounced	Usage
Alessia	-	Italian
Eunomia	-	Greek Mythology
FevzİYe	-	Turkish
Kilian	KEE-lee-ahn (German)	German, Irish, French
GÉRard	zhe-RAHR	French
Gro	-	Norwegian