Shape and structure are often used interchangeably, but they do have subtle differences. When discussing the external appearance or form of an object, "shape" is the go-to word. It refers to the outline, silhouette, or contour of something. On the other hand, "structure" delves deeper, referring to the way something is built or organized. Areas where "shape" and "structure" intersect include the arrangement, composition, framework, design, and configuration of an object. Some alternatives to "shape structure" could be form, build, physique, formation, arrangement, layout, anatomy, composition, or framework. These synonyms encapsulate the essence of both shape and structure, providing a well-rounded representation of an object's exterior and interior characteristics.