Parvenu

имя существительное [французский язык] парвеню, выскочка Синоним(ы): upstart, forward pupil

Большой англо-русский словарь

Parvenu

noun (plural parvenus) Etymology: French, from past participle of parvenir to arrive, from Latin pervenire, from per through + venire to come — more at for, come one that has recently or suddenly risen to an unaccustomed position of wealth or power and has not yet gained the prestige, dignity, or manner associated with it • parvenu adjective

Merriam-Webster's Collegiate Dictionary