Brownnoser, a derogatory term used to describe a person who flatters or sucks up to someone in power, has several synonyms. One of the most commonly used synonyms is "ass-kisser," which describes someone who indulges in excessive flattery to gain favor with someone else. Other synonyms include "bootlicker," "sycophant," and "yes-man." These terms are often used interchangeably and all describe someone who is willing to compromise their integrity to curry favor with someone in a superior position. While these actions are often frowned upon, it is important to remember that it is possible to be honest and still maintain a productive relationship with those in power.