Synonyms of know-all

nounSomeone who obnoxiously claims to be knowledgeable on a subject.

• Buddha
• clever clogsSomebody who is rather too clever; a smart aleck; sometimes used as an epithet.
• clever dick UKA person who annoyingly tries too hard to impress with their cleverness.
• know-it-all USSomeone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice...
• smart aleckOne who is pretentious about their own cleverness or knowledge.
• smart assA person regarded with an obnoxiously determined advancement of one's own personality, wishes, or views.
• smartyAn obnoxiously clever or quick-witted person.
• smarty pantsA smart aleck or know-it-all.
• wiseacreOne who feigns knowledge or cleverness; one who is wisecracking; an insolent upstart.
• wiseassOne who makes wisecracks, particularly in a sassy or cocky fashion.
• wise-ass
• wisenheimer USA self-assertive and arrogant person; a wiseacre or smart aleck.