The term "most white-haired" can be replaced with several synonyms depending on the context. Some of the options include "silver-haired," "snowy-haired," "ashen-haired," "pale-haired," and "hoary-haired." Each of these synonyms can be used to describe a person or animal that has a significant amount of white or gray hair. These terms can also be used to describe a situation, such as a snowy-haired landscape or ashen-haired clouds. The use of these synonyms can add depth and variety to writing, allowing for a more descriptive and engaging style.