In Genesis 1:5, it is written,

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> 5 God called the light Day, and the darkness He called **Night**. So the **evening** and the morning were the first day. NKJV, ©1982
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> ה וַיִּקְרָא אֱלֹהִים לָאוֹר יוֹם וְלַחֹשֶׁךְ קָרָא לָיְלָה וַיְהִי־עֶרֶב וַיְהִי־בֹקֶר יוֹם אֶחָד
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Why does the Bible use different words like עֶרֶב (*erev*) for evening and לַיְלָה (*laila*) for night when they both denote the same thing?