These are all default registry entries of this type.
This registry is modify-able through datapacks.
boss
chance_chest
chest
elite_mob
elite_mob_horde
empty
harvest_spawner
league_back
league_spawn_pos
map_boss
map_reward
map_teleporter
mob
mob_horde
obelisk_reward
obelisk_spawner
teleport_back_block
uber_boss_altar