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The Japanese word

七日

is pronounced
nanoka | なのか
means
seven days, the seventh day (of the month)
Examples:
一週間は七日です。
ichi shūkan wa nana nichi desu.
There are seven days in a week. | A week has seven days.
一週間は七日です。
ichi shūkan wa nana nichi desu.
In one week there are seven days.
この年の正月は十四日から十七日まで四日間の雪を見た。
kono toshi no shōgatsu wa jū yon nichi kara jū nana nichi made yon nichikan no yuki o mi ta.
In the first month of that year, I saw that it snowed for four days from the 14th until the 17th. | In January of that year, we saw snow for four days, from the fourteenth to the seventeenth.
Examples sourced from tatoeba.org