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.