• 御飯ごはん — cooked rice, meal
• 朝飯あさめし — breakfast
• 昼飯ひるめし — lunch
• 晩飯ばんめし — dinner
• 飯店はんてん — restaurant (mainly Chinese)
• 飯台はんだい — low dining table

飯 is made up of the 食 (eat) radical and 反 (反る/そる), indicating food that “returns” or “fills you.” In Japanese, it directly means cooked rice but also refers to meals in general.

The kun-yomi “めし” is especially common in casual speech, while the on-yomi “ハン” appears in more formal or compound words like 御飯ごはん and 飯店はんてん.

今日きょうの 晩飯ばんめしは カレーです。
Tonight’s dinner is curry.

朝あさは 白しろい飯めしを食たべた。
I ate white rice for breakfast.

“めし” is a direct, sometimes masculine or informal way to say meal or food. “ハン” is more formal and found in compound terms like 御飯ごはん (rice) or 飯店はんてん (restaurant).