The first hint to crack the puzzle "The 15th letter of the Greek alphabet" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "The 15th letter of the Greek alphabet" is:

It starts with letter o

The third hint to crack the puzzle "The 15th letter of the Greek alphabet" is:

It ends with letter n

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The answer for the puzzle "The 15th letter of the Greek alphabet" is: