Category Nuances matching essential:

• little,
• basic,
• everyday,
• small,
• out,
• monthly,
• expensive,
• up,
• elementary,
• miscellaneous,
• minimal,
• nutritional,
• agricultural,

Members for simple category essential:

• egg,
• nucleus,
• medical_requirement,
• basic_necessity,
• sugar,
• comb,
• lip,
• nut,
• chalk_bag,
• water,
• activity_bag,
• tool,
• plate,
• clean_water,
• brush,
• distillation_unit,
• automobile_part,
• oil,
• bag,
• coal,
• cassava,
• drink,
• energy_bill,
• pocket_tool,
• cold_drink,
• hot_plate,
• good_water,
• unpolluted_water,
• garbage_bag,
• household_bill,
• pot,
• petroleum,
• utility_bill,
• plentiful_water,
• tissue,
• mug,
• soft_drink,
• bean,
• fuel_bill,