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.

Thank you. I've also sent
Amy a relationship TERMINATION notice...
The Big Bang Theory Season 4, Episode 5

Behold the Mobile Omnidirectional
Neutralization and Termination Eradicator.
The Big Bang Theory Season 2, Episode 12

It marked me and my friends
for TERMINATION.
Westworld Season 3, Episode 8