Silencing your keyboard makes your keyboard quieter. There are two ways you can do this. O-rings and silent stems. O-rings are a bit louder than silent stems, but it is easier to do. Swapping out the stems is a bit more difficult but the result is a much quieter keyboard. I'll be discussing stem swapping in this blog post.
I found Gazzew Silent Linear Stems online and they are pretty great at reducing noise. Swap them out by removing the the top housing, just as you would when spring swapping, and replace the stem. You can even do this while you are swapping springs and/or lubing so that you don't have to open the switch more than once.
The Gazzew stems I found reduced the sound considerably and made the keyboard a bit smoother even without any lube.