Modifiers matching enclosure:

• small,
• indoor,
• electrical,
• electronic,
• acoustic,
• controlled,
• secondary,
• permanent,
• tight,
• primary,
• durable,
• protective,
• occupied,
• single,
• labyrinthine,
• fireproof,
• recreational,
• animal,
• open,
• artificial,
• entire,
• cool,
• metallic,
• vehicular,
• portable,
• inside,
• metal,
• smaller,
• plastic,
• surrounding,
• large,
• complicated,
• standard,
• floating,
• spatial,
• sturdy,
• porous,
• physical,
• private,
• permeable,
• temporary,
• gothic,
• larger,
• secure,
• outdoor,
• practical,
• marine,
• new,
• underground,
• safe,
• dark,
• suitable,
• impermeable,
• transparent,
• closed,
• special,

Simple categories matching sturdy:

• bag,
• component,
• substrate,
• furniture,
• material,
• enclosure,
• predator,
• fabric,
• stone,
• surface,
• green,
• bench,
• product,
• clothing,
• object,
• prop,
• wood,
• structure,
• protection,
• base,
• book,
• pan,
• compound,
• paper,
• herb,
• cutter,
• pole,
• shelter,
• stuff,
• item,
• bicycle,
• clothes,
• container,
• footwear,
• equipment,
• metal,
• instrument,
• shoes,
• fixture,
• toy,
• brush,
• paint,
• card,
• cloth,
• plant,
• board,
• post,
• tree,
• cotton,
• furnishing,
• pot,
• stick,
• box,
• support,
• device,