This is the 6661st most frequent Japanese word.
ハクサイ
"Chinese cabbage."
The word 'ハクサイ' is used as a subject to denote an ingredient commonly used in cooking.
ハクサイは鍋料理によく使われます。
Hakusai is often used in hot pot dishes.
Here, 'ハクサイ' is a direct object, representing the item purchased in an action.
昨日、スーパーでハクサイを買いました。
I bought hakusai at the supermarket yesterday.
In this usage, 'ハクサイ' specifies the plant being cultivated.