Modifiers matching impurity:

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

Simple categories matching reactive:

• radical,
• solid,
• molecule,
• group,
• metal,
• mixture,
• amine,
• halogen,
• chemical,
• gas,
• intermediate,
• paraffin,
• material,
• element,
• passion,
• oxide,
• compound,
• mineral,
• solute,
• battery,
• diluent,
• allergen,
• emotion,
• substrate,
• substance,
• adhesive,
• foil,
• impurity,
• aggregate,
• concern,
• mechanism,
• portion,
• attitude,
• disease,
• aldehyde,
• surface,
• binder,
• medium,
• particle,
• cell,
• residue,
• sentiment,
• problem,
• system,
• measure,
• metabolite,
• olefin,
• halide,
• resin,
• fluid,
• carbonyl,
• sorbent,
• component,
• anhydride,
• atmosphere,
• carbohydrate,
• alkene,
• state,
• product,
• behavior,
• constituent,
• sugar,
• rock,
• coating,
• protein,
• process,
• experience,
• food,
• contaminant,
• ingredient,
• species,
• polymer,
• monomer,
• hydrocarbon,
• complication,
• object,
• ketone,
• elements,
• entity,
• waste,
• agent,
• precursor,
• silicide,
• fuel,
• atom,
• change,
• derivative,
• alloy,