When talking about a single voice, there are many different synonyms that can be used. Some of the most common include solo, one voice, lone voice, solitary voice, individual voice, and only voice. Each of these synonyms carries slightly different connotations, but they all refer to the idea of a solitary vocalization that stands out from a larger group. Whether you are describing a solo performer on stage or a person speaking up amidst a sea of voices, each of these synonyms can help you convey the idea of a single voice that commands attention and stands out in its own right.