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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.
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.)