Speculator : a person who invests in stocks, property, or other ventures in the hope of making a profit.Teacher : a person who teaches, especially in a school.Critic : a person who judges the merits of literary or artistic works, especially one who does so professionally.Preacher : a person who preaches, especially a minister of religion.Cognoscente : a connoisseur; a discerning expert.Synonym of Cognoscente is Critic