This is the 5744th most frequent Japanese word.
てん菜
Sugar beet.
In this sentence, てん菜 refers to the edible nature of sugar beets in a general context.
てん菜を食べたことがありますか？
Have you ever eaten sugar beets?
In this sentence, てん菜 refers to sugar beets as a raw material for producing sugar.
てん菜は、砂糖の原料として使われています。
Sugar beets are used as a raw material for sugar.
Here, てん菜 is used to refer to a crop being cultivated by farmers.