Ivory-billed is a term used to describe a specific type of woodpecker with a distinctive ivory-colored bill. Other possible synonyms for this term could include ivory-beaked, ivory-tipped, ivory-crested, or ivory-crowned. These terms all emphasize the unique ivory-colored bill of this woodpecker species. Other possible synonyms might focus on the striking appearance or habitat of this bird, such as black-and-white woodpecker, swamp woodpecker, or bayou bird. Ultimately, the choice of synonyms for "ivory-billed" will depend on the context and the specific qualities of this particular woodpecker species that the writer wishes to emphasize.