What natural phenomenon gets its name from the Japanese word meaning harbor and wave?

tsumani
津波 /tsu na mi/ means 'tidal wave' and literally means 'harbor/port wave'. A gigantic wave would be called 巨波 /kyo ha/ in Japanese.
zingdolke
Tidal wave in Japanese is 津波 (tsunami).
The Japanese Word tsunami means harbor wave, and is used for the massive movement of ocean water that can follow an earthquake or volcanic eruption. Typically, these "tidal waves" are shallow at sea and then gain increased height in shallower water near the shore.
there is no Word in Japanese that literally translates to "Harbour wave". minato no nami

litterally translates to harbour wave but it is 2 Words

tsunami translates to tidal wave

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港の波 is what I found in google Translate (harbour wave [minato no nami]). Also it's spelled "harbor", not "harbour" (just saying).