This is the 200th most frequent Arabic word.
اليوم
"Today."
Here, 'اليوم' is used as an adverb of time to indicate when the weather is beautiful.
اليوم الطقس جميل.
Today the weather is beautiful.
In this sentence, 'اليوم' acts as a time locator for the action of bringing homework.
أحضرت واجبي اليوم.
I brought my homework today.
The word 'اليوم' is the subject of the sentence, referring to the current day, emphasizing its role as a noun.