Modifiers matching mark:

• special,
• visible,
• diacritic,
• unique,
• fixed,
• identifiable,
• opaque,
• permanent,
• proprietary,
• colored,
• distinctive,
• physical,
• diacritical,
• simple,
• small,
• visual,
• temporary,
• grammatical,

Simple categories matching opaque:

• material,
• adhesive,
• paper,
• object,
• structure,
• medium,
• image,
• surface,
• ink,
• particle,
• rock,
• stone,
• article,
• gemstone,
• document,
• filler,
• product,
• container,
• paint,
• sack,
• fiber,
• coating,
• substance,
• substrate,
• sheet,
• conductor,
• symbol,
• assembly,
• metal,
• layer,
• powder,
• fence,
• contaminant,
• barrier,
• web,
• sunscreen,
• content,
• cell,
• ingredient,
• oxide,
• picture,
• liquid,
• plastic,
• creature,
• matter,
• glass,
• matrix,
• pigment,
• tissue,
• original,
• solid,
• gem,
• obstacle,
• component,
• system,
• imperfection,
• aggregate,
• bag,
• obstruction,
• item,
• fabric,
• fluid,
• part,
• foodstuff,
• film,
• copy,
• language,
• body,
• mark,
• mineral,
• beverage,