Q: Some keywords not work

Try this:  How to Reset NVRAM on your Mac - Apple Support

If your keyboard is still under warranty, call tech support.  Let them deal w/it. Out of warranty,  take it to your local Apple Store or an APSP.

Could be that the keyboard has finally died.  Take it into the nearest Genius bar and have it checked out.  Or, if you have access to another Mac test it with it.

Go to the System/Keyboard preference pane and reset all settings. Reset the Bluetooth settings. 

Also check in the Shortcuts pane and restore defaults.  See if that will make a difference.

Apple will give it a free diagnosis. 

As another test log into another user account on your Mac and see if the problem persists.  If it does then it's system wide and could be the keyboard.