Modifiers matching impurity:

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

Simple categories matching homogeneous:

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