使つか
tsukaiwake

Noun
Suru Verb

1. proper use; using (different things) for different purposes

引用いんようした問題もんだいではありませんが、関係かんけいだい名詞めいし関係かんけい副詞ふくし使つかけを問題もんだいがリーディングセクションにはあります。
in'yō shita mondaidewārimasenga kankēdaimēshito kankēfukushino tsukaiwakeo tō mondaiga riidingusekushonniwa arimasu.
The problem quoted isn't one, but there are problems in the reading section that ask you to distinguish relative pronouns from relative adverbs.
Other forms: