People in the Northwest constantly use the wrong names for floating homes. Most often someone will call a floating home a houseboat, but by definition, a houseboat is a boat, like Great Ambition. In this shot taken at Lake River, you can see the thing that makes it a houseboat, the motors.
A floating home on the other hand does not have motors, it cannot move under its own power, it just sits there tied to the dock, usually with chains (some insurance companies require chains on your floating home!).
Probably the reason people make this mistake is because of another structure, a boathouse. This is a floating building that houses a boat to keep it dry and out of the weather. A boathouse is not a houseboat, and a houseboat is not a floating home.