The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

The Defender of the Vale!
Game of Thrones Season 6, Episode 4

I saw her public DEFENDER
on TV.
Breaking Bad Season 5, Episode 15

and has been a DEFENDER of the Watch
and the Wall almost all of his life.
Game of Thrones Season 5, Episode 2

Now, Leonard, as the DEFENDER,
The Big Bang Theory Season 11, Episode 16

That one went public DEFENDER.
Thanks for nothing.
Breaking Bad Season 2, Episode 8