I wanna get the differences straight once and for all.
Stuns - you can't do shit
Knock up - the same as stun, but you're knocked up in the air so an Yasuo can ult you for example
Root - you can't move
Snare - you can't move
Silence - you can't use abilities and summoners
Now from one of these you could flash and use abilities, but I'm not sure. And finally:
Suppressions - you can't do shit just wait for them to be over
I'm sure I got some of these wrong so make things clear for me. Thanks.