Modifiers matching impurity:

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

Simple categories matching homogeneous:

• formation,
• membrane,
• product,
• substance,
• material,
• medium,
• catalyst,
• public,
• commodity,
• unit,
• group,
• fluid,
• activity,
• space,
• object,
• reaction,
• silica,
• country,
• part,
• phase,
• tissue,
• fuel,
• polymer,
• state,
• rock,
• substrate,
• food,
• article,
• surface,
• web,
• system,
• alloy,
• population,
• corpus,
• trait,
• body,
• layer,
• resin,
• particle,
• subgroup,
• thermoplastic,
• figure,
• organ,
• organs,
• item,
• mixture,
• compound,
• sector,
• parcel,
• waste,
• terrain,
• region,
• institution,
• deposit,
• structure,
• catalysis,
• area,
• shaft,
• solid,
• entity,
• society,
• metal,
• matrix,
• impurity,
• liquid,
• feature,