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Fighters are also known as bruisers. They are the same, whether you call someone bruiser or fighter. They are synonyms. And no sion's kit screams tank. He has cc and durability. Durability encompasses both high health pool and high resistances. A tank's job is to disrupt the enemy and soak enemy fire.
The definition of a juggernaut is this "Juggernauts are melee titans who relentlessly march down the opposition and devastate those foolish enough to get within their grasp. They are the only subclass who excel at both dealing and taking significant amounts of damage, but in turn they have a tough time closing in on targets due to their low range and extremely limited mobility", aka high durability, high damage but no mobility.
The definition of a diver is this "Divers are the more mobile portion of the Fighter class. Divers excel at singling out high-priority targets to blitz toward, immediately forcing those targets (and their teammates) to deal with the diver’s presence. Divers are not as durable as the tanks or juggernauts of the world, but Divers can take their fair share of punishment while bringing enough damage to be a real kill threat if left unchecked", aka not as durable or damaging as juggies but more mobile.
The definition of a fighter is this "Fighters (also known as Bruisers) are a diverse group of short-ranged combatants who excel at both dealing and surviving damage." Fighters then are subclassed to juggernauts and divers.
As i said;
Juggs are not tanks.
Bruisers are not tanks.
Fighters are not tanks.
Fighters are not bruisers, but bruisers are fighters.
Fighters are not juggs, but juggs are fighters.
Ehem
Juggs are not tanks.
Bruisers are not tanks.
Fighters are not tanks.
Fighters and bruisers are the exactly the same.
Some fighters are juggs, but juggs are fighters.
The exception to the jugg rule is the wierd state urgot is in, as he is theoretically a juggernaut but lacks juggernaut itemization.
Wrong he practically is a juggernaut. His kit is made to deal heavy damage, while also absorbing a fair amount of damage. His ranged nature makes it difficult to use some items but he is a juggernaut to the very core.