Almost always possible: default

overworld0: mountain
overworld1: plains
overworld-beach: beach, water
overworld-autumn: autumn
overworld-graveyard: graveyard

cave0: actual_cave
cave1: ice_cave, glitch_cave

church: default
house: default

dungeon0: level, cave_level, water_level, jungle_level, built_level
dungeon1: level, cave_level, water_level, jungle_level, built_level
dungeon2: level, cave_level, water_level, jungle_level, built_level
('level' is intended as a sort of miscellaneous category, but often ends up having the nuclear reactor entrance and the missinglasses / glitches inside)

