English questions

1. 宵夜 = Evening snacks 或 late night snacks.
2. supper 和 dinner
Indeed, they are the same, but, supper is a home dinner for sure. Dinner is an official meal for eat out and it can be a party or even a 宴會. Yet you still can say: I have my dinner at home. 無人會話錯.
有什麼分別? At least, nobody would say supper party but only dinner party (joking!!!)
3. 小食是不是 snack?
That is right. Except, 通常我們需用復數加 s. (一小小食確難以忍受)

1. 宵夜 : a night snack / 只講 supper 也可以

2. supper 的意思比 dinner沒那麼正式. 雖然都是晚餐, 和客人 / 社交場合吃的一定不能講為 supper, 要講 dinner.
家裡吃的晚飯, supper 和 dinner 意思一樣.

3. 小食就是snack. 買來一份份, 隨手吃的是snack. 正餐之間吃的小點心也是snack.
中文的小食有時也指飯前的開胃菜, 那是 entree 或 appetiaser.