Here are some other terms for large, fancy boats that don't include the word "boat":
* Ship: This is a general term for a large vessel, but it can also be used for more luxurious ones.
* Superyacht: This specifically refers to a very large and luxurious yacht, often exceeding 100 feet in length.
* Mega Yacht: These are the largest and most luxurious yachts, often exceeding 300 feet in length.
* Sailing Vessel: This is a more formal term for a boat that is powered by sails, but can also refer to large, luxurious yachts.
Let me know if you have anything else in mind!