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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!