We don't have synonyms for gannet yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are garnet, annet and bannet.
°any of three species of large seabird in the genusMorus, of the family Sulidae. They have black and white bodies and long pointed wings, and hunt for fish by plunge diving and pursuing their prey underwater.
°any of three species of large seabird in the genusMorus, of the family Sulidae. They have black and white bodies and long pointed wings, and hunt for fish by plunge diving and pursuing their prey underwater.