Gemini replied:
Whether a "better" word exists depends on what specific aspect of the concept you want to emphasize:
1. For a Luxury/Formal Floating Hotel:.
Floating Hotel: The most accurate and universally formal descriptor.
Ship Hotel: Best for large, converted liners (e.g., Queen Mary.)
2. For Temporary/Mobile Accommodation on Water:
Liveaboard Charter: Used in the sailing/diving industry to describe multi-day trips where guests sleep on the vessel.
Conclusion:
If you are looking for the most accurate and formal term, use "Floating Hotel".
If you are looking for a high-end, luxurious term, use "Boutique Vessel".
If you are just looking for a catchy, instantly understandable word, "Boatel" actually does its job quite effectively!