My husband eats rocks for lunch at noon.
lunch ★★★★☆
a nap ★★★☆☆ KUNKUN 昼 (noon) + 寝 (go to bed) = 昼寝 (a nap)
lunch-break ★★★☆☆ 昼 (noon) + 休 (rest) = 昼休み (lunch-break )
lunch-break (at work, school, etc.)