This is the 569th most frequent Japanese word.
弁当
A Japanese packed meal, typically consisting of rice, protein, and vegetables.
In this sentence, '弁当' is used to refer to a meal box typically prepared and portioned, describing the food item consumed.
私は昼に美味しい弁当を食べました。
I ate a delicious bento for lunch.
Here, '弁当' refers to a prepared meal box that is being made by someone's mother, focusing on the action of preparation.
母が弁当を作ってくれました。
My mother made a bento for me.
In this context, '弁当' illustrates a meal box that is available to buy, commonly referring to convenience or travel food packages.