The word "most yellowish brown" is a specific shade that can potentially be described in a variety of ways. Some synonyms for this color may include shades such as ochre, amber, or mustard. These colors could all be used to describe a hue that is somewhat yellow but also has brown undertones. Another synonym for this shade might be tuscan, which is a warm, earthy brown color that contains hints of yellowness. Depending on the context and desired level of specificity, different synonyms may be used to describe this color accurately and effectively.