A "super zombie" is a zombie who has become unnaturally strong. They are encountered several times through the series and possess similarities.
In Resident Evil CODE: Veronica, the sadistic Rockfort Island prison doctor, Paul Stoker climbs out of a body bag as Claire leaves the room, when she returns, he is devouring another body. Paul becomes a super zombie taking at least two Grenade Launcher grenade rounds to kill. Notably the corpse he was eating helps him fight, but only as a normal zombie.