As nouns the difference between tsunami and whirlwind
is that tsunami
is a very large and destructive wave, generally caused by a tremendous disturbance in the ocean, such as an undersea earthquake or volcanic eruption while whirlwind
is a violent windstorm of limited extent, as the tornado, characterized by an inward spiral motion of the air with an upward current in the center; a vortex of air. It usually has a rapid progressive motion.
As an adjective whirlwind is
rapid and minimal: a whirlwind tour
, a whirlwind guide