Vocal fremitus refers to the vibration felt on the chest while a person speaks. However, there are several synonyms for vocal fremitus that can be used interchangeably. One such synonym is "vocal vibration". This term describes the same sensation felt when a person produces sound through speaking or singing. Another synonym for vocal fremitus is "vocal resonance". This implies the sound waves produced by the vocal cords resonating and transmitting through the chest cavity. Lastly, "vocal thrill" can also be used as a synonym for vocal fremitus. It refers to the tactile vibration felt while someone speaks, alluding to the thrill-like sensation caused by vocal cord vibrations.