1. Flow, gush, spout, spurt refer to certain of the movements characteristic of fluids. Flow is the general term: Water flows. A stream of blood flows. To gush is to rush forth copiously from a cavity, in as large a volume as can issue therefrom, as the result of some strong impelling force: The water will gush out if the main breaks. Spout and spurt both imply the ejecting of a liquid from a cavity by some internal impetus given to it. Spout implies a rather steady, possibly well-defined, jet or stream, not necessarily of long duration but always of considerable force: A whale spouts. Spurt implies a forcible, possibly sudden, spasmodic, or intermittent issue or jet: The liquid spurted out suddenly when the bottle cap was pushed in. Spout applies only to liquids; the other terms apply also to gases.

Did you mean floatable?