The word "subpallium" refers to a part of the brain that is located beneath the pallium. Some possible synonyms for this term include subcortical structure, basal ganglia, and striatum. These terms all describe regions in the brain that play important roles in various functions, such as movement control, reward processing, and decision making. Other possible synonyms for subpallium might include subcortical regions, deep brain structures, or subcortical nuclei. While these terms may vary in their precise meaning and usage, they all refer to important parts of the brain that are involved in a wide range of cognitive and behavioral processes.