Noun and する verb
はっけん
自たくのベランダで、イモムシを発見しました。
I found hornworms on my balcony.
がんは、早き発見することがひじょうに重ようです。
It’s very important to have early detection for cancer.
Facebookでお金を稼ぐ方法を発見したぜ。しかも超簡単なの。まず、アカウント設定に行くだろ、それからアカウントを停止して、仕事に行くんだ！
I discovered how to make money from Facebook. It’s easy. Just go to your account settings, deactivate your account, and go to work.
You make departure from your home off into the great beyond. You will go to see the unseen, and hopefully make a great discovery.
This is a jukugo word, which usually means on'yomi readings from the kanji. You know the はつ part, which gets shortened to はっ. The 見 is unlike what you learned with 見, though.
In order to remember that this is けん, imagine you're going out to make a discovery of some strange new lands. With strange new lands, there comes strange new people. This one has a samurai named Ken けん on it. He's trying to discover new things too!