Modifiers matching impurity:

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

Simple categories matching lighter:

• substance,
• meal,
• wood,
• material,
• alkane,
• sauce,
• model,
• shade,
• construction,
• hydrocarbon,
• soil,
• computer,
• fabric,
• impurity,
• solid,
• item,
• food,
• contaminant,
• fuel,
• thing,
• meat,
• cotton,
• works,
• undergarment,
• compound,
• birthmark,
• gas,
• ion,
• particle,
• object,
• petrochemical,
• hardwood,
• molecule,
• fraction,
• ingredient,
• grouping,
• antiparticle,
• equipment,
• user,
• furniture,
• vehicle,
• artifact,
• dishware,
• elements,
• equivalent,
• tool,
• mixture,
• craft,
• rock,
• alkene,
• fare,
• music,
• piece,
• medium,
• fibre,
• element,
• constituent,
• wine,
• fruit,
• liquid,
• body,
• oil,
• product,
• sediment,
• garment,
• bag,
• solute,
• mineral,
• baryon,
• animal,
• shirt,
• fluid,
• textile,
• feature,
• gadget,
• component,
• clothing,
• smoke,
• part,
• manufacturing,
• debris,
• flavor,
• color,
• system,
• metal,
• olefin,
• article,
• drug,
• log,
• vegetable,
• tea,
• stuff,
• dish,
• waste,
• fiber,
• project,
• distillate,
• atom,