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.

She was a PEASANT girl.
Game of Thrones Season 5, Episode 5

♪ Can you help a little PEASANT
That's begging on her knees? ♪
Breaking Bad Season 4, Episode 7

lord or PEASANT, our choices are the same.
Game of Thrones Season 5, Episode 1

You ignorant PEASANT!
Wake up!
Vikings Season 1, Episode 8

If I'd been born a PEASANT they might've
left me out in the woods to die.
Game of Thrones Season 1, Episode 2