Question

Why do we add 't' to tsunami even though it is silent​

Answer 1

Some English speakers – not all – simplify the word 'tsunami' by not pronouncing the initial 't', so that it fits in with the phonological rules of English. Often silent letters in English are actually diacritic letters. This means that rather than being pronounced, they change the pronunciation of another syllable

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Answer 2

It is a Japanese name for the tidal waves. "tsu" means harbour and "nami" means waves. Thus the name is given to the tidal waves that cause destruction is tsunami.