This is the 1213th most frequent Arabic word.
نيسان
April.
In this sentence, "نيسان" refers to the month of April in the calendar.
أنا أذهب في إجازة في شهر نيسان.
I am going on vacation in the month of April.
Here, "نيسان" is used to refer to the brand Nissan, which is a car manufacturer.
لقد اشتريت سيارة نيسان حديثة.
I bought a modern Nissan car.
In this instance, "نيسان" again refers to the month of April when cherry blossoms typically bloom.