what are Villagers classified as?

I am trying to create a custom mob and I want it to target monsters, animals and ambient creatures but not villagers, golems , themselves, the player or any mobs that don't attack them first. No matter what I configure, they will still either attack the villagers or they will attack similar mobs.I have tried to make it so that they look for the armor they wear in the armor slots, but they seem to ignore that.