Ticket
Coupon, Pass
noun, suffix
The kanji and the word are exactly the same. That means they share meanings as well.
券 is a standalone word that means ticket, but it's commonly used as a suffix to form words like 入場券 (admission ticket), 割引券 (discount coupon), or 定期券 (commuter pass).
The reading is the same as what you learned with the kanji. Usually it's attached to things, because it tells you what kind of ticket something is.
薬局で、割引券をもらいました。
At the pharmacy, I got a discount coupon.
映画の券が余ってるんだけど、よかったらいらない？
I have an extra movie ticket, would you like it?
三ヶ月の定期券をもらえますか？
Can I get a commuter pass for three consecutive months?