The answer is very simple. There is no
difference. They are more or less synonyms.
However, in modern times we prefer the term
tsunami and strongly discourage the term tidal
wave. The reason is that there is NOTHING tidal
about a Tsunami. Tsunamis are generated when an
earthquake, huge landslide or large meteorite
impact occurs and displaces a lot of water.
Tides form in response to the sun and moon
and have nothing to do with Tsunamis.
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