Modifiers matching mark:

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

Simple categories matching opaque:

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