Modifiers matching tank:

• single,
• marine,
• underground,
• tall,
• concrete,
• large,
• small,
• dirty,
• heavy,
• removable,
• outdoor,
• smaller,
• portable,
• larger,
• typical,
• closed,
• metal,
• empty,
• special,
• mobile,
• chemical,
• cylindrical,
• difficult,
• plastic,
• suitable,
• round,
• fragile,

Simple categories matching empty:

• receptacle,
• container,
• drive,
• area,
• box,
• surface,
• zone,
• pleasure,
• space,
• building,
• thing,
• structure,
• tank,
• item,
• tin,
• body,
• jar,
• room,
• bottle,
• vessel,
• vehicle,
• object,
• package,
• array,
• equipment,