What is another word for "buoy"?

Roget's Thesaurus (1911) lists these synonyms for "buoy": air, airy, astatic, attollent, balloon, barm, bubble, buoyancy, buoyant, capstan, cobweb, convection, convexity, cork, crane, derrick, down, draft, drag, drawn, dredge, dredger, dust, elevate, elevated, elevation, elevator, erect, erection, escalator, ether, ethereal, exalt, exaltation, feather, feet, ferment, fish, float, floating.