Modifiers matching glass:

• hard,
• flat,
• interior,
• special,
• cheap,
• colored,
• typical,
• opaque,
• industrial,
• architectural,
• natural,
• working,
• under,
• large,
• decorative,
• tall,
• black,
• clear,
• functional,
• handmade,
• broken,
• safe,
• soft,
• amorphous,
• durable,
• blown,
• dimensional,
• pure,
• plane,
• stained,
• optical,
• prepared,
• fine,
• small,
• inexpensive,
• resistant,
• ornamental,
• inhomogeneous,
• expensive,
• thin,
• beautiful,
• textured,
• artificial,
• polished,
• fixed,
• harder,
• cold,
• grown,
• antique,
• warm,
• melting,
• inorganic,
• persian,
• coloured,
• narrow,
• nearby,
• curved,
• transparent,
• fragile,
• hollow,

Simple categories matching flat:

• art,
• underside,
• surface,
• original,
• object,
• drawing,
• accessory,
• plan,
• speaker,
• artwork,
• material,
• item,
• package,
• article,
• plane,
• specimen,
• plate,
• rock,
• linen,
• stage,
• fish,
• substrate,
• bread,
• shape,
• condition,
• paper,
• component,
• mineral,
• form,
• epithelium,
• seal,
• tin,
• area,
• topology,
• product,
• bottle,
• base,
• copy,
• pan,
• card,
• fabric,
• road,
• segment,
• circuit,
• member,
• region,
• structure,
• ornament,
• stone,
• block,
• works,
• glass,
• gasket,
• mirror,
• course,
• deck,
• substance,
• vehicle,
• creature,
• charge,
• wire,
• particle,
• brush,
• record,
• polygon,
• web,
• instrument,
• muscle,
• ride,
• lighting,
• graphic,
• land,
• metal,
• tray,
• crystal,
• space,
• clothing,
• dish,
• terrain,
• roof,
• ribbon,
• equipment,
• blade,
• embellishment,
• food,
• board,
• tool,
• wall,
• option,
• portion,
• medium,
• facility,
• image,
• floor,
• mold,
• artifact,
• place,
• work,
• solid,
• design,
• abstraction,
• stick,
• foliage,
• background,
• earth,
• section,
• figure,
• footwear,
• string,
• pad,
• sheet,
• collection,
• thing,
• body,
• side,
• marker,
• support,
• slab,
• ground,
• strip,
• book,
• feature,
• fruit,
• x-ray,
• representation,
• document,
• container,
• device,
• rod,
• conductor,
• painting,
• fee,
• screen,
• panel,
• tissue,
• flower,
• furniture,
• weapon,
• cover,
• display,
• foot,
• cookware,
• waveform,
• tube,
• paint,
• cloth,
• bottom,
• piece,
• ceiling,
• upland,
• system,
• sign,
• subject,
• ware,
• content,
• part,
• textile,
• shield,
• implement,
• blank,
• tableware,