If you are looking for synonyms for the term "more white-headed," some options might include "whiter-headed," "more pale-headed," "more snow-white-haired," "more ivory-headed," or even "more pearl-colored-haired." All of these terms convey the idea of a head that is predominantly white in color, whether due to age, genetics, or some other reason. Depending on the context and the intended tone of your writing, you might choose to use one of these synonyms over another. Ultimately, the goal is to find the word or phrase that best captures the precise shade and nuance of meaning you are trying to convey.