Modifiers matching impurity:

• unwanted,
• heavier,
• mobile,
• physical,
• airborne,
• common,
• initial,
• hazardous,
• little,
• volatile,
• absorptive,
• nonpolar,
• damaging,
• coarse,
• microscopic,
• colloidal,
• heterogeneous,
• out,
• minute,
• atmospheric,
• small,
• particulate,
• environmental,
• harmful,
• soluble,
• organic,
• ordinary,
• homogeneous,
• possible,
• dissolved,
• lightweight,
• insoluble,
• minor,
• corrosive,
• dilute,
• mental,
• suspended,
• reactive,
• anionic,
• residual,
• inorganic,
• smaller,
• separate,
• interfering,
• foreign,
• fluid,
• fine,
• active,
• gaseous,
• harmless,
• chemical,
• undesired,
• solid,
• visible,
• lighter,
• random,
• polar,
• desirable,
• up,
• natural,
• unavoidable,
• mechanical,
• biological,
• stubborn,
• ionic,
• micro,
• light,
• off,
• sticky,

Simple categories matching random:

• object,
• surface,
• condition,
• event,
• state,
• process,
• set,
• act,
• game,
• situation,
• noise,
• attribute,
• diversion,
• quantity,
• thing,
• disruption,
• variable,
• field,
• impurity,
• signal,
• occurrence,
• hardware,
• perturbation,
• sport,
• magazine,
• merchandise,
• crime,
• goody,
• piece,
• elements,
• item,
• form,
• phase,
• device,
• equipment,
• animal,
• catastrophe,
• system,
• toy,
• means,
• feeder,
• conductor,
• stuff,
• song,
• block,
• solid,
• behavior,
• scene,
• shock,
• disturbance,
• shape,
• furnishing,
• mutation,
• violence,
• component,
• incident,
• alteration,
• evolution,
• area,
• interference,
• error,
• clothes,
• parameter,
• procedure,
• model,
• data,
• topic,
• people,
• group,
• place,
• structure,
• artifact,
• characteristic,
• drawing,
• material,
• variation,
• property,
• information,
• location,
• change,
• fault,
• times,
• works,
• generator,
• light,
• cause,
• sum,
• content,
• accident,
• influence,
• character,
• order,
• movement,
• anachronism,
• message,
• experience,
• space,
• terms,
• search,
• array,
• packing,
• drift,
• pattern,
• selection,
• activity,
• number,
• opponent,
• failure,
• motion,
• fluctuation,
• mechanism,
• medium,
• part,
• phenomenon,
• tragedy,
• sound,
• subject,
• fluid,
• particle,
• force,