Modifiers matching reservoir:

• medical,
• liquid,
• natural,
• subsurface,
• impermeable,
• geophysical,
• vast,
• sedimentary,
• internal,
• traditional,
• environmental,
• underground,
• biological,
• geological,
• geologic,
• large,
• seasonal,
• nonliving,
• external,
• small,
• local,
• common,
• deep,
• mobile,
• stable,
• fluid,
• simple,
• home,

Simple categories matching subsurface:

• separation,
• facility,
• material,
• structure,
• variable,
• stratum,
• property,
• item,
• component,
• platform,
• feature,
• data,
• change,
• condition,
• anomaly,
• industry,
• system,
• formation,
• utility,
• soil,
• information,
• obstruction,
• liquid,
• attribute,
• rock,
• void,
• process,
• cavity,
• detail,
• artifact,
• defect,
• measure,
• layer,
• mineral,
• fluid,
• resource,
• excavation,
• drain,
• deposit,
• reservoir,
• construction,
• body,
• variation,
• area,
• installation,
• object,
• quantity,
• sorbent,
• imperfection,