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Correct--a tsunami happening at high tide, or on a plus tide will have far more reach and cause more devastation than one happening at low tide or on a minus tide...meaning only that it won't reach as far inland..not that there won't be damage.
Sorry, that is not true at all. It is a mistaken notion that they are the same thing. Calling a tsunami a tidal wave is an error.
You are correct that hurricane and typhoon are used to mean the same thing in various areas of the world, but a tsunami is a tsunami. Period. "Tidal Waves" have only to do with the normal motion of the daily tides. (See my full answer.)