According to the Vocabulary Building and Communication Training Center, some antonyms for the word "sycophant" include "authority" or "boss." The word "leader" acts as another antonym for "sycophant."
Those in authority or command are the opposite of sycophants. The Vocabulary Building and Communication Training Center describes sycophants as those who give flattery to someone in authority for personal gain. They act servile in nature towards those with power, and they do so to gain an advantage. They are sometimes referred to as bootlickers, brown-nosers, lackeys or yes-men. According to Synonym Antonym, some other similar terms to "sycophant" include "backscratchers," "minions," "doormats," "puppets" and "slaves."