Modifiers matching imperfection:

• atomic,
• microscopic,
• subsurface,
• minor,
• cosmetic,
• planar,
• crystalline,
• small,
• stubborn,
• localized,
• optical,
• geometric,
• serious,
• structural,
• morphological,
• abstract,
• opaque,
• internal,
• geometrical,
• natural,
• institutional,
• significant,
• large,
• mechanical,
• isolated,
• facial,
• little,
• dissimilar,
• visible,
• superficial,
• external,
• exterior,
• dermatological,
• physical,
• layer,
• visual,
• spatial,
• out,
• major,
• under,
• interfacial,
• static,
• macro,
• technical,
• local,
• analog,

Simple categories matching subsurface:

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