We don't have synonyms for moonpool yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are moon pool, moonboot and moonmoon.
(n) :
Alternative form of moon pool. [(nautical, chiefly oil industry) An opening in the base of the hull of a vessel (especially a marine drilling platform), which is used for lowering equipment into the sea below.]
(n) :
Alternative form of moon pool. [(nautical, chiefly oil industry) An opening in the base of the hull of a vessel (especially a marine drilling platform), which is used for lowering equipment into the sea below.]