big wheel

Synonyms:

big cheese, big deal, big enchilada, big fish, big gun, big shot, head honcho

Types:

knocker

(Yiddish) a big shot who knows it and acts that way; a boastful immoderate person

supremo

the most important person in an organization

Type of:

important person, influential person, personage

a person whose actions and opinions strongly influence the course of events