n. 25B6; noun
the building was hit by a whirlwind : TORNADO, hurricane, typhoon, cyclone, vortex; Austral. willy-willy; N. Amer. informal twister.
a whirlwind of activity : MAELSTROM, welter, bedlam, mayhem, babel, swirl, tumult, hurly-burly, commotion, confusion; informal madhouse; N. Amer. three-ring circus.
25B6; adjective a whirlwind romance : RAPID, lightning, headlong, impulsive, breakneck, meteoric, sudden, swift, fast, quick, speedy; informal quickie.