What is another word for "buoyant"?

Roget's Thesaurus (1911) lists these synonyms for "buoyant": air, airy, astatic, back, baleen, balloon, barm, bounce, bubble, buoy, buoyancy, caoutchouc, cobweb, convection, cork, distend, down, draft, ductile, dust, elastic, elasticity, ether, ethereal, extend, feather, ferment, flex, flexibility, flexible, float, floating, flue, gossamer, gossamery, gum, helium, hot, hydrogen, imponderability.