Sex differences in humans refer to the biological and physiological variations between males and females. However, there are various synonyms for sex differences in humans, such as gender differences, sexual dimorphism, and sexual differentiation. Gender differences often describe differences in the societal roles, behaviors, and expectations of males and females. Sexual dimorphism describes the differences in physical characteristics such as bone structure, muscle mass, and overall body proportions. Sexual differentiation is the process through which males and females develop different reproductive systems. Understanding these synonyms can help individuals communicate more effectively and accurately when discussing sex differences in humans.