Dictionary / Vocabulary / 使い分け
つかいわけ
proper use; using (different things) for different purposes
common word Also written 使いわけ、使分け
引用した問題ではありませんが、関係代名詞と関係副詞の使い分けを問う問題がリーディングセクションにはあります。
The problem quoted isn't one, but there are problems in the reading section that ask you to distinguish relative pronouns from relative adverbs.
米酢と穀物酢の使い分けをあまり気にしてなかった。
I didn't really pay attention to the difference between rice and grain vinegar.