Modifiers matching impurity:

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

Simple categories matching off:

• object,
• surface,
• reactant,
• fluid,
• furnishing,
• track,
• equipment,
• control,
• item,
• apparel,
• characteristic,
• trail,
• material,
• insect,
• appliance,
• menu,
• source,
• treasure,
• contamination,
• area,
• web,
• thing,
• furniture,
• peripheral,
• industry,
• bottle,
• activity,
• actuator,
• chemical,
• season,
• accessory,
• animal,
• hours,
• room,
• installation,
• instrument,
• perch,
• radiation,
• ability,
• sweetener,
• service,
• property,
• solute,
• piece,
• weapon,
• molecule,
• firework,
• substance,
• gas,
• event,
• craft,
• contaminant,
• day,
• brand,
• particle,
• ground,
• impurity,
• clothing,
• heat,
• structure,
• filter,
• point,
• stain,
• energy,
• project,
• measure,
• nature,
• shop,
• fuel,
• land,
• food,
• opening,
• wall,
• protein,
• waste,
• street,
• liquid,
• times,
• predator,
• bird,
• move,
• feature,
• period,
• scent,
• product,
• line,
• device,
• dirt,
• residue,
• roads,
• road,
• light,
• signal,
• machine,
• indicator,
• lock,
• container,
• month,
• night,
• part,
• system,