Mute, not functioning on all apps

[KENASH20]

When I set my phone to mute  / from sound, on the swipe down button, imagine my surprise (and embarrassment) when I continued to get sounds from "Words with Friends".  This also makes me wonder, what other things can this or other apps do that I have told the phone not to allow?  Audio recordings / Video recordings / access to keystrokes and passwords???!!!!!!!!  NOT COOL!

[Elements]

Is it possible that "Set As Priority" is enabled in the notification settings for that app?

[KENASH20]

I went into notifications, and turned off "allow notifications" and it still made noise.

It wasn't until I dug through the bottom of WWF, that I found the settings to turn off the notifications within the application it's self.  ONLY then, would the app be silent.  It seemed nothing I changed on the S8 prevented the app from making noises.

As I said before NOT COOL!!!  What else can this or other apps do or access regardless of the settings on the Galaxy S8???