"Undead". he says gently. Zombies is probably a word they wouldn't have heard of here, considering it usually involves some sort of virus that is spread through a bite. "They are dead corpses risen through magic. Although... I don't think they all realize it." They don't seem to, after what happened in the boats.

regardless, Kaneki shakes his head - the suit makes that hard to do, but he still does it. "It seems some necromancers decided to rise armies to fight for them." at least from what he gathered as well. Since Kaneki is new, there is a lot he is still learning about.