There are many synonyms for the term "asskisser" that can be used to describe someone who aims to gain favor by flattery or fawning behavior. Some of these synonyms include bootlicker, brown-noser, sycophant, toady, flatterer, and yes-man. These terms often carry negative connotations and imply that the person is insincere and motivated by their own self-interest. It's important to use these terms judiciously and ensure that they are not used to unfairly or maliciously describe someone. However, having a robust vocabulary can help us communicate our ideas more effectively and with greater nuance.