Alltalk is used to describe someone who talks a lot or is known for being talkative. There are several synonyms for this word, some of which include gabby, loquacious, chatty, verbose, garrulous, and voluble. Other synonyms for alltalk are blabbermouth, motor-mouth, and windbag. These words tend to have a negative connotation and may be used to describe someone who talks too much or does not know when to stop. In contrast, words like conversationist and communicator have a positive connotation and reflect someone who is skilled at engaging in conversation. Ultimately, the choice of synonym depends on the context and intention behind the description of the talkative person.