Modifiers matching obstacle:

• dense,
• architectural,
• physical,
• vertical,
• natural,
• world,
• external,
• artificial,
• tall,
• dynamic,
• fixed,
• mechanical,
• high,
• difficult,
• creative,
• structural,
• narrow,
• dangerous,
• institutional,
• urban,
• linear,
• tricky,
• nearby,
• additional,
• removable,
• solid,
• large,
• unusual,
• simple,
• passive,
• outdoor,
• distant,
• environmental,
• multiple,
• adjacent,
• coming,
• visual,
• clear,
• opaque,
• impenetrable,
• over,
• elevated,
• soft,
• concrete,
• small,
• single,
• movable,
• stationary,
• everyday,
• rigid,
• size,
• hazardous,
• overhead,
• special,
• geographic,
• advanced,
• penetrating,
• rectangular,
• interfering,
• geological,
• extensive,
• static,
• wooden,
• practical,
• typical,
• local,
• rural,
• moving,
• unmovable,
• underground,
• porous,
• permanent,
• thick,
• private,
• common,
• working,
• psychological,

Simple categories matching solid:

• object,
• obstruction,
• explosive,
• sheet,
• material,
• drink,
• credential,
• equipment,
• formation,
• sorbent,
• catalyst,
• wood,
• waste,
• film,
• surface,
• organ,
• combustible,
• saccharide,
• fuel,
• wall,
• aerosol,
• anchor,
• coating,
• timber,
• edible,
• support,
• structure,
• substrate,
• aluminum,
• thing,
• particle,
• attribute,
• sweetener,
• portion,
• foam,
• fat,
• feed,
• entity,
• fare,
• characteristic,
• electrode,
• neoplasm,
• decoration,
• paper,
• matter,
• assets,
• tissue,
• scrap,
• quality,
• article,
• pollutant,
• recipe,
• layer,
• substratum,
• filler,
• acid,
• particulate,
• implement,
• ring,
• foundation,
• instrument,
• alcohol,
• ballast,
• ball,
• tree,
• plastic,
• powder,
• coal,
• precursor,
• message,
• base,
• embolus,
• flooring,
• medium,
• agent,
• polymer,
• plant,
• carbon,
• shaft,
• lead,
• lubricant,
• pane,
• earth,
• data,
• fertiliser,
• composition,
• device,
• starches,
• idea,
• converter,
• backing,
• value,
• volume,
• footgear,
• colors,
• mixture,
• soil,
• fiber,
• ink,
• information,
• thermoplastic,
• fruit,
• constituent,
• cosmetic,
• hydrocarbon,
• state,
• nature,
• projectile,
• unit,
• receptacle,
• carbohydrate,
• symbol,
• substance,
• organs,
• cylinder,
• contamination,
• fencing,
• commodity,
• polygon,
• ornament,
• abrasive,
• dosage,
• topper,
• compound,
• preparation,
• cement,
• content,
• salt,
• concrete,
• world,
• element,
• ware,
• dielectric,
• joint,
• science,
• line,
• plan,
• beverage,
• propellant,
• bar,
• member,
• nickel,
• fabric,
• metal,
• component,
• manure,
• lipid,
• rest,
• magnet,
• sterol,
• profession,
• item,
• projection,
• biomass,
• fibre,
• ingredient,
• hair,
• byproduct,
• viscera,
• makeup,
• subject,
• product,
• recovery,
• aggregate,
• specimen,
• tone,
• resin,
• conductor,
• sample,
• top,
• facility,
• missile,
• stone,
• color,
• grey,
• fertilizer,
• slurry,
• volatile,
• binder,
• cheese,
• deformation,
• tumor,
• oxide,
• part,
• impurity,
• system,
• electrolyte,
• education,
• contaminant,
• publication,
• malignancy,
• lesion,
• carbonate,
• furniture,
• section,
• process,
• carrier,
• coat,
• shape,
• cancer,
• rod,
• mechanics,
• boundary,
• insulator,
• core,
• crystal,
• medicine,
• barrier,
• food,
• oil,
• guidebook,
• solute,
• construction,
• clothing,
• tumour,
• debris,
• adhesive,
• area,
• deposit,
• fixture,
• body,
• property,
• medication,
• planet,
• block,
• tool,
• addition,
• pollution,
• medicament,
• mass,
• drug,
• team,
• space,
• laser,
• pin,
• residue,
• region,
• needle,
• interface,
• hardwood,
• protein,
• form,
• spread,
• weapon,
• evidence,
• favorite,
• stick,
• brand,
• piece,
• footwear,
• counter,
• platform,
• investment,
• foodstuff,
• meal,
• vegetable,
• figure,
• chemical,
• stain,
• sphere,
• fluid,
• container,
• sugar,
• stuff,
• image,
• absorbent,
• thread,
• feature,
• iron,
• board,
• wax,
• cargo,
• grain,
• obstacle,
• fence,
• fastener,
• representation,
• refrigerant,
• rock,
• growth,
• gemstone,
• matrix,
• mineral,