Swellhead is a word that is used to describe someone who has an exaggerated sense of self-importance or self-worth. There are several synonyms that can be used in place of this word, including egotist, narcissist, braggart, bighead, and conceited. These words all convey a similar meaning, but each has its own particular nuances. For example, an egotist is someone who is excessively self-absorbed and self-centered, while a narcissist is someone who is obsessed with his or her own appearance and achievements. A braggart is someone who boasts about his or her accomplishments, while a bighead is someone who is arrogant and self-important. Finally, a conceited person is someone who thinks very highly of himself or herself, often to the point of looking down on others.