The word "more s-shaped" refers to any object, line or curve that resembles the letter S. This could include anything from a flowing river, to a winding road, to a curvaceous body. Some synonyms for "more s-shaped" might include "curvaceous", "serpentine", "sinuous", "undulating", "twisting", "turning", "meandering", "corkscrew" or "coiling". Depending on the context, any number of these words could be used to describe something that follows a similar path to the letter S. Each of these words has its own slightly different connotation, and can add extra depth to any description that includes them.