Modifiers matching cover:

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

Simple categories matching rigid:

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