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Also Read: Understanding Japanese Writing | Learn Japanese Colors
When letters are not available for a word in Hiragana, then they are usually written with Katakana letters.
Japanese has 46 letters and combination letters in each of its' alphabets - Hiragana, and Katakana; and the Kanji alphabet which contains about 50,000 ideographs, which express a complete thought, meaning, or idea. Modern day knowledge of Kanji and schooling requirements is about 2000 Kanji; although for everyday use the number is probably much less.
Each of the letters in hiragana and katakana are pronounced the same, mean the same; however, they are written differently.
Also, Katakana, has additional letters and combination letters
that Hiragana does not have.
To see the letters of each Japanese alphabet and learn how to pronounce them: view here and, to learn how to write the letters : view here