to float · to hover · to drift (also fig., to lead a wandering life) · to rove · showy · superficial

Wood floats.

Oil will float on water.

The sea looked quite green, and large icebergs were floating about.

She had an uncomfortable feeling that while this odd child's body might be there at the table her spirit was far away in some remote airy cloudland, borne aloft on the wings of imagination.

The Sargasso Sea is a vast patch of ocean named for a genus of free-floating seaweed called Sargassum.