We don't have synonyms for seabass yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sea bass, seabags and sebass.
(n) :
Alternative form of sea bass, used especially in compound terms. [Any of various species of saltwater fish in various families, or a specimen thereof, in several families in order Perciformes]
(n) :
Alternative form of sea bass, used especially in compound terms. [Any of various species of saltwater fish in various families, or a specimen thereof, in several families in order Perciformes]