These are all default registry entries of this type.
This registry is modify-able through datapacks.
ambient
animal
blue_skies
lycanite_mobs
minecraft:bee
minecraft:drowned
minecraft:ender_dragon
minecraft:enderman
minecraft:iron_golem
minecraft:polar_bear
minecraft:wither
minecraft:wolf
minecraft:zombie
minecraft:zombified_piglin
mob
npc
other
player