There are numerous synonyms for the phrase "lower voice" that can be used interchangeably, depending on the context. A few options include "deeper tone," "lower pitch," "gravelly voice," "bass voice," "husky voice," and "baritone voice." Each of these phrases can be used when describing someone with a voice that is lower or deeper than average. Depending on the situation, some phrases may be more appropriate than others. For example, "husky voice" may be used to describe someone with a throaty, rough sound, while "baritone voice" usually refers to someone with a deeper, more resonant sound.