Toadeater is a derogatory term that refers to a person who flatters their boss or superior excessively. There are many synonyms that can be used in place of this term, including sycophant, brownnoser, apple polisher, lickspittle, flatterer, fawner, and bootlicker. These words all describe a person who ingratiates themselves to someone in authority in hopes of gaining favor or personal benefit. While some of these terms may be less common than others, they all convey the same idea of a person who is insincere and manipulative in their efforts to gain favor with those in power.