course can mean "a dish" and is a countable noun. Generally, it refers to one of the many dishes at dinner or banquet.

"dish, course, diet and cuisine" can all be used to express the differences between nouns of "food and dishes".

① both "dish" and "course" can refer to a specific "dish"; "diet" mainly refers to "daily diet"; "cuisine" means "the cooking style of a country or region".

(1) "dish"

The word "dish" originally meant "plate, saucer". In different cultures, people's dining styles and habits are quite different.

Then, the word "dish" which means "dish" was later extended to mean "dish", that is to say, whether it is cold dish or hot dish, world-famous food or local snacks, it can be called "a dish".

（2）“course”。

although the nouns "course" and "dish" can both mean "dishes", the usage of "course" is more formal and can only refer to "a dish" in dinner.

(3)diet

When talking about food-related topics, the noun "diet" has two meanings:

First, For example, a balanced diet. The second meaning is "dieting, limiting eating". I'm on a diet. I'm on a diet

(4)cuisine

The noun "cuisine" means "cooking" in Latin, and it means "the cooking style of a country, region and culture" in English, which is an uncountable noun.

in addition, "cuisine" can also refer to "delicious food cooked in a specific way". For example, we can use the noun "cuisine" to mean "delicious food somewhere".