We don't have synonyms for catboats yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are catboat, flatboats and faltboats.
(n) :
A sailing boat with a single sail, usually rigged on a gaff spar, used for fishing in New England and later adapted for racing and cruising. It has a single mast set near to the bow and a long boom which may extend over the stern.
(n) :
A sailing boat with a single sail, usually rigged on a gaff spar, used for fishing in New England and later adapted for racing and cruising. It has a single mast set near to the bow and a long boom which may extend over the stern.