There are many synonyms for the phrase "boast of," and each has its own unique connotations. Some options include brag, crow, show off, gloat, revel in, parade, declare, proclaim, flaunt, vaunt, and trumpet. All of these words suggest a sense of pride or satisfaction in one's accomplishments, possessions, or abilities. However, each of them also implies slightly different nuances - for example, "brag" tends to be more negative and implies a lack of humility, whereas "vaunt" suggests a more formal or grandiose expression of pride. With so many synonyms to choose from, writers can vary their language and tone to suit the context in which they are writing.