The complete list of vanilla loot tables. 

chests/spawn_bonus_chest
chests/simple_dungeon
chests/village_blacksmith
chests/abandoned_mineshaft
chests/nether_bridge
chests/stronghold_library
chests/stronghold_crossing
chests/stronghold_corridor
chests/desert_pyramid
chests/jungle_temple
chests/jungle_temple_dispenser
chests/igloo_chest
chests/woodland_mansion
entities/witch
entities/blaze
entities/creeper
entities/spider
entities/cave_spider
entities/giant
entities/silverfish
entities/enderman
entities/guardian
entities/elder_guardian
entities/shulker
entities/iron_golem
entities/snowman
entities/rabbit
entities/chicken
entities/pig
entities/polar_bear
entities/horse
entities/donkey
entities/mule
entities/zombie_horse
entities/skeleton_horse
entities/cow
entities/mushroom_cow
entities/wolf
entities/ocelot
entities/sheep
entities/sheep/white
entities/sheep/orange
entities/sheep/magenta
entities/sheep/light_blue
entities/sheep/yellow
entities/sheep/lime
entities/sheep/pink
entities/sheep/gray
entities/sheep/silver
entities/sheep/cyan
entities/sheep/purple
entities/sheep/blue
entities/sheep/brown
entities/sheep/green
entities/sheep/red
entities/sheep/black
entities/bat
entities/slime
entities/magma_cube
entities/ghast
entities/squid
entities/endermite
entities/zombie
entities/zombie_pigman
entities/skeleton
entities/wither_skeleton
entities/stray
entities/husk
entities/zombie_villager
entities/villager
entities/evocation_illager
entities/vindication_illager
entities/llama
entities/vex
entities/ender_dragon
gameplay/fishing
gameplay/fishing/junk
gameplay/fishing/treasure
gameplay/fishing/fish