A really fast thesaurus... with lots of synonyms.
Words to describe a voice include soft, gravelly, booming, melodic, and shrill — pick one for the texture, the volume, the pitch, or the tone of how someone sounds.
Describe the texture (soft, gravelly, velvety), the volume (booming, quiet, commanding), the pitch (shrill, deep), or the tone (melodic, monotone) — each captures a different quality of how someone sounds.
Words like booming, resonant, and commanding suit a powerful deep voice, while gravelly, husky, and gruff describe a deep, rough-edged one.