There are several synonyms for the word "hydrolith," which refers to rocks that have been altered by water. One common synonym is "hydrothermal rock," which refers to rocks that have been changed by hot water or steam. Another synonym is "diagenetic rock," which refers to rocks that have been altered by chemical or physical processes after their original formation. Additional synonyms for hydrolith include "water-formed rock," "aqueous rock," and "hydrolytic rock." These terms are useful for geologists and other scientists who study the effects of water and other fluids on rock formations, and they can help clarify the types of processes that have shaped the earth's geology over millions of years.