Simple categories matching five:

• variable,
• elements,
• event,
• group,
• medium,
• item,
• bath,
• compound,
• sugar,

Members with property five:

• tango,
• air,
• open-air_bath,
• galactose,
• glucose,
• total_protein,
• waltz,
• family_car,
• music,
• uric_acid,
• vienna_waltz,
• carpet,
• home_value,
• new_kitchen,
• wind,
• fox_trot,
• money_base,
• fine_arts,
• sucrose,
• urea,
• dance,
• maltose,
• cholesterol,