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On Wanikani I've long since learned "entrance" as 入{い}り口{ぐち}. However, in my
textbook, I just came across the vocabulary word for "entrance" and it writes
it as 入{いり}口{ぐち}. I note that the pronunciation is the same in both cases
「いりぐち」 but what's the difference between the two kanji writings?

I looked it up on jisho and only found 入口 (though 入り口点 on jisho uses the い
reading of 入). Does this mean I should normally be writing this as 入口 and
wanikani is wrong, or is this a matter of preference?
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2017-09-30T17:59:30.190
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kanji readings okurigana
Difference between 入口 and 入り口
They are both correct. Japanese vocabulary has all sorts of different
spellings of the same words, it's just that many of them are archaic or simply
uncommon.

[According to Kanshudo, 入口 is the most common, and 入り口 is the second most
common.](https://www.kanshudo.com/searchq?q=%E5%85%A5%E3%82%8A%E5%8F%A3)

You will come across words like these constantly, especially if you are
interacting with a large variety of Japanese media. It's best to learn each
reading when you do.
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2017-09-30T19:06:37.747
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The り is called okurigana It is used to ensure the reading. Naturally the
Japanese people know that 入口 can only be read いりぐち。but in some other cases the
reading can be ambiguous. therefore they add some time hiragana to help the
reading. These are just 2 ways of writing but they are similar.

(Here, you could read 入口 as にゅうこう without the り but that just doesn't make
sense)
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