To Cure
To Heal, To Ease
transitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb.
The kanji itself means cure, and this verb means to cure, to heal or to ease something. This particular verb is when someone does the curing. The illness or injury doesn't just get better by itself. How can you remember that? Because when you try to heal someone and you mess up, they can try to sue (す) you.
なおす
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
I need you to heal him, and I need you to heal him right now (なお). NOW NOW NOW!
This also shares the reading for 直す, a very similar word you learned previously, which means "to fix." I'm guessing that the Japanese word なおす was only one word ("to fix" and "to cure" are pretty similar, right?). Then, there were two Chinese words for it (as you can see with the kanji), so the one Japanese word got split into two very similar words.
生理つうを治すにはアスピリンを飲むのがいいよ。
You should take some aspirin to ease your period pain.
ハーブりょう法でがんを治すことについて、どう思われますか？
What do you think of curing cancer by using an herbal remedy?
ビエトだけが、コウイチが怪我や病気を治すことができる不思議な力を持っていることを知っている。
Only Viet knows that Koichi has strange powers that can heal injuries and sicknesses.