moist, profit, enrich
潤う（うるおう）、潤す（うるおす）、利潤（りじゅん）
to be moist, to moisten, profit
On-reading (ジュン) is used in compounds; kun-reading (うるお(す)) is used standalone or with okurigana. Appears in many compounds — memorize the key ones rather than the kanji in isolation. Has multiple meanings (moist; profit; enrich). Context determines which applies — pay attention in reading passages. This kanji forms verbs/adjectives with okurigana. Practice both the word form and compound forms.
From the JLP Quiz question bank — the word in the form it is actually tested in.
「潤う」の読み方はどれか。
Answer: うるおう
「潤す」の読み方は？
Answer: うるおす
