Modifiers matching cover:

• upland,
• protective,
• small,
• impermeable,
• thin,
• under,
• heavy,
• impervious,
• decorative,
• temporary,
• external,
• waterproof,
• shallow,
• aesthetic,
• natural,
• personal,
• loose,
• basic,
• light,
• pedestrian,
• fixed,
• restricted,
• vegetative,
• free,
• rigid,
• respiratory,
• soft,
• dermal,
• wet,
• functional,
• supporting,
• floating,
• hard,
• appropriate,
• handmade,
• flat,
• transparent,
• outdoor,
• necessary,
• weak,
• movable,
• open,
• removable,
• common,
• weather,
• large,
• additional,
• dead,
• woody,
• suitable,
• overhead,
• sterile,
• metallic,
• resistant,
• delicate,
• painted,
• little,
• shiny,
• portable,
• isolated,
• absorbent,
• thick,
• unreachable,
• dense,

Simple categories matching rigid:

• connector,
• surface,
• appliance,
• material,
• web,
• object,
• structure,
• vehicle,
• armour,
• measure,
• matrix,
• container,
• medium,
• instrumentation,
• cover,
• substrate,
• body,
• stick,
• article,
• organs,
• tip,
• packing,
• motion,
• strip,
• protein,
• boot,
• item,
• fixture,
• deck,
• tubing,
• obstacle,
• post,
• particle,
• cylinder,
• element,
• construction,
• fabric,
• unit,
• molecule,
• appendage,
• thermoplastic,
• carrier,
• splint,
• transparency,
• profile,
• form,
• product,
• luggage,
• group,
• feature,
• case,
• matter,
• fastener,
• sorbent,
• alteration,
• panel,
• lining,
• obstruction,
• mineral,
• gel,
• frame,
• rock,
• mechanism,
• cement,
• pipe,
• finish,
• movement,
• means,
• part,
• pavement,
• plate,
• fibre,
• change,
• entity,
• rod,
• shape,
• wall,
• textile,
• hitch,
• foundation,
• connection,
• bottle,
• cloth,
• resin,
• sheet,
• monomer,
• instrument,
• shaft,
• implement,
• system,
• display,
• thread,
• document,
• cutoff,
• casing,
• food,
• dressing,
• sphere,
• member,
• transformation,
• boundary,
• plant,
• component,
• organ,
• coil,
• airfoil,
• watercraft,
• space,
• fixing,
• adhesive,
• filler,
• support,
• hanger,
• base,
• portion,
• substance,
• layer,
• tissue,
• aggregate,
• fiber,
• polymer,
• device,
• macromolecule,
• architecture,
• package,
• foam,
• plastic,
• devices,
• floor,
• bed,
• sector,
• block,
• insulation,
• solid,
• ground,
• barrier,
• representation,
• deposit,
• tube,
• metal,
• covering,
• paper,
• class,
• piece,
• tool,