Modifiers matching stain:

• soluble,
• stubborn,
• tough,
• heavier,
• clean,
• industrial,
• great,
• exterior,
• oily,
• unsightly,
• everyday,
• domestic,
• basic,
• hard,
• common,
• coloured,
• simple,
• organic,
• permanent,
• heavy,
• hydrophilic,
• complicated,
• greasy,
• difficult,
• visible,
• chemical,
• colored,
• lipophilic,
• little,
• fatty,
• internal,
• necessary,
• proteinaceous,
• special,
• unusual,
• sensitive,
• off,
• liquid,
• light,
• unwanted,
• normal,
• blue,
• harmful,
• dry,
• biodegradable,
• topical,
• standard,
• solid,
• dangerous,
• dark,

Simple categories matching difficult:

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