A soliloquist is someone who speaks or talks to oneself. But, there are other words or phrases that can be used in its place, such as self-talker, monologist, or self-conversationalist. These synonyms can be used interchangeably with soliloquist depending on the context or tone of the conversation. Other phrases that can be used in place of soliloquist include self-communicator, solo-talker, or talk-to-selfist. These synonyms can be helpful in writing or conversations when trying to mix up language while still conveying the same meaning. And while all these words have different connotations, they all describe a person who talks to themselves.