'Op' or operator is the vanilla minecraft version of an administrator or moderator in certain permissions plugins. Really they aren't comparable as operator privileges usually are disabled in most permission plugins. However, if you were to compare it, OP would be better seeing as they have access to all the commands in vanilla Minercaft, whereas moderators usually are somewhat restricted in control.
/op [player name] make player a mod /deop [player name] make an already mod not a mod
Sounds like it's part of the Better Dungeons mod.
The hexxit mod is free. It is actually one of the better and safer mods out there.
You can't. Only the admin/op/mod can unmute you. (unless you want to hack into the server console which is illegal)
Some good mods are: More creeps and weirdos mod millionaire mod better than wolves mod aether mod
a mod where you can fly a plane on minecraft so get it
Nope. You HAVE to download a minecraft mod to have it.
Minecraft doesn't have an official best mod.
One example of a superhero mod in Minecraft is Superheros Unlimited for version 1.6.4.
Mo Creatures is a modification (mod) for Minecraft. You can get this mod by downloading it from The Minecraft Forums.
Just search in google 'Minecraft mod downloader'
You can get a mod to do just about ANYthing you want, just do a Yahoo/Google search for something like "minecraft mod".