Question

a seven letter word containing thousands of letters what is it

Answer 1

Mailbox containing of several letters ------- mailbox is a seven letter word------- letters meaning messages -------
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Answer 2

This question is actually a riddle type question which we have to solve by using special logic.

Now we all know that homonyms are often confusing and widely used for this type of riddle questions.

(Words with same spelling or pronounciation but with different meanings are known as the homonyms).

Similarly, the first "letter" word in this question represents alphabet and the second "letter" in this question represents the written communication method mainly by a paper.

That's why the answer should be "MAILBOX".