This is the 1851st most frequent Japanese word.
昼食
Lunch.
In this sentence, 昼食 is used as the direct object of the verb 食べる (to eat).
私は今日は昼食にカレーライスを食べました。
Today, I ate curry rice for lunch.
Here, 昼食 is used as the subject of the sentence and paired with the verb とる (to have).
昼食は12時ごろにとる予定です。
I plan to have lunch around 12 o'clock.
In this case, 昼食 is paired with the potential form of 食べる, showing the action of eating lunch as a possibility.