The word "marrowed" is not a widely used term in the English language, and as a result, synonyms for this word are also limited. However, there are a few words that can be used in place of "marrowed" such as "hollowed," "drilled," or "excavated." These words all imply the creation of a cavity or channel in an object or substance. Alternatively, the word "enriched" could be used to indicate the filling or infusion of nutrients or beneficial substances into something. Ultimately, the best synonym for "marrowed" will depend on the specific context in which it is being used.