The word "resounder" means something that produces a loud and deep sound. There are several synonyms for this word and some of them are "thunderous," "booming," "sonorous," "thundering," "rumbling," and "resonant." Thunderous refers to a sound that is very intense, loud and powerful. Booming means a sound that is deep, resonating and loud. Sonorous is used to describe a full, rich, and deep sound that is pleasing to listen to. Thundering refers to a sound that is very loud and deep, like the sound made by thunder. Rumbling means a low-pitched sound that is continuous and resonating. Resonant refers to a sound that vibrates with a frequency that produces a pleasing effect.