Simple categories matching nonexistent:

• entity,
• facility,
• thing,

Members with property nonexistent:

• phlogiston,
• fictional_character,
• storage_pool,
• ideal,
• building,
• virtual_particle,
• hair,
• qi,
• unicorn,
• volume,
• hare_horn,
• proposition,
• chimera,
• centaur,
• god,
• city,
• mathematical_object,
• income,
• capital,
• giant,
• round_square,