Graf Zeppelin accrue accumulate advance aeroplane aerostat air bubble airlift airplane airship appreciate bag ball ballonet be airborne bead belly belly out bilge billow bladder bleb blimp blister bloat blob blood blister boll bolus boom bouge breed broaden bubble bug bulb bulbil bulblet bulge bulk bulla captive balloon conglobulate crescendo cruise develop dilate dirigible dirigible balloon distend drift ellipsoid enlarge expand extend ferry fever blister fill out flit fly fob gain gain strength gasbag geoid get ahead glide globe globelet globoid globule glomerulus go up gob gobbet goggle greaten grow hop hover hydroplane increase intensify jet knob knot lighter-than-air craft mount multiply mushroom navigate oblate spheroid orb orbit orblet pellet pilot balloon pocket poke pooch pop pouch pout prolate spheroid proliferate puff up rigid airship rise rondure round out run up sac sack sail sailplane sausage seaplane semirigid airship ship shoot up snowball soap bubble soar sphere spherify spheroid spherule spread strengthen stretch swell swell out take the air take wing tumefy vesicle volplane wax weather balloon widen wing zeppelin