"Du Bois" is a proper noun that is typically associated with the African American civil rights leader and author W.E.B. Du Bois. However, there are several potential synonyms for this term, depending on the context. Alternatives might include "black intellectual," "social critic," or "race activist." In a broader sense, some additional synonyms could include "advocate," "champion," or "defender," as Du Bois was widely known for his outspoken support of racial justice and equality. Ultimately, the most appropriate synonym for "Du Bois" will depend on the specific context and the intended meaning of the term.