This is the 732nd most frequent Vietnamese word.
cơm
Rice (cooked).
In this sentence, 'cơm' specifically refers to cooked rice, which is a staple food in Vietnamese cuisine.
Tôi ăn cơm mỗi ngày.
I eat rice every day.
Here, 'cơm' is used more generally to mean a meal, particularly dinner.
Chúng tôi đi ăn cơm tối ở nhà hàng.
We go to have dinner at the restaurant.
In this sentence, 'cơm' again means cooked rice, contrasting with another dish, 'phở'.