A loquacious newcomer often dominates conversations or talks at length without interruption. Synonyms for the word "loquacious" could include talkative, chatty, verbose, garrulous, or loquatious. Meanwhile, synonyms for the word "newcomer" could include novice, beginner, neophyte, or greenhorn. Some other possible combinations of synonyms that could capture the essence of a loquacious newcomer could be a chatty novice, a verbose beginner, a garrulous neophyte, or a loquacious greenhorn. Regardless of the word choice, however, it is important to approach newcomers with patience and understanding as they navigate new social situations.