Wiktionary
flotel
n. 1 a ship converted to a permanently moored hotel. 2 living quarters built on a floating platform, such as near an offshore oil rig.
Wikipedia
Flotel
Flotel, a portmanteau of the terms floating hotel, refers to the installation of living quarters on top of rafts or semi-submersible platforms. Flotels are used as hotels on rivers or in harbour areas, or as accommodation of working people, especially in the offshore oil industry.