Modifiers matching tray:

• difficult,
• plastic,
• shallow,
• special,
• larger,
• wooden,
• sliding,
• flat,

Simple categories matching difficult:

• location,
• signal,
• zone,
• sugar,
• area,
• idea,
• symptom,
• material,
• vessel,
• part,
• science,
• dermatosis,
• card,
• emotion,
• surface,
• target,
• disease,
• treatment,
• condition,
• picture,
• shape,
• stuff,
• installation,
• original,
• item,
• text,
• suit,
• situation,
• stain,
• system,
• class,
• artifact,
• institution,
• circumstances,
• subject,
• deposit,
• plastic,
• powder,
• matter,
• coating,
• container,
• commodity,
• information,
• content,
• particle,
• compound,
• food,
• obstacle,
• structure,
• object,
• peak,
• injury,
• behavior,
• space,
• trait,
• image,
• illness,
• point,
• fire,
• site,
• substance,
• pregnancy,
• concept,
• behaviour,
• thing,
• disorder,
• sector,
• bond,
• texture,
• fuel,
• dog,
• dirt,
• region,
• feeling,
• job,
• concern,
• activity,
• flow,
• feature,
• process,
• quarry,
• fabric,
• placement,
• shot,
• matrix,
• delivery,
• waste,
• tank,
• access,
• problem,
• position,
• environment,
• conflict,
• event,
• substrate,
• fibre,
• math,
• place,
• fluid,
• pose,
• polymer,
• measurement,
• weather,
• rock,
• joint,
• group,
• time,
• contaminant,
• odor,
• tumour,
• articulator,
• case,
• ground,
• medium,
• work,
• works,
• component,
• surgery,
• hardware,
• video,
• article,
• apparatus,
• mission,
• cave,
• stone,
• soil,
• maneuver,
• course,
• period,
• infection,
• carbohydrate,
• years,
• instrument,
• times,
• issue,
• labor,
• fiber,
• setting,
• metal,
• profession,
• crossing,
• topic,
• insecticide,
• product,
• terrain,
• question,
• state,
• language,
• discipline,
• reality,
• tray,