Modifiers matching impurity:

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

Simple categories matching heterogeneous:

• characteristic,
• material,
• system,
• soil,
• thing,
• information,
• state,
• phase,
• solid,
• tissue,
• signal,
• structure,
• solution,
• substrate,
• disorder,
• texture,
• copolymer,
• molecule,
• protein,
• process,
• body,
• disease,
• territory,
• mixture,
• symptom,
• dielectric,
• component,
• medium,
• polymer,
• culture,
• entity,
• aggregate,
• trait,
• tool,
• membrane,
• oxide,
• polymerization,
• rock,
• part,
• phenomenon,
• matter,
• gene,
• fluid,
• client,
• particle,
• fiber,
• endeavor,
• element,
• condition,
• behavior,
• content,
• polity,
• impurity,
• sediment,
• surface,
• waste,
• cancer,
• peer,
• reaction,
• methodology,
• area,
• substance,
• environment,
• sector,
• commodity,
• support,
• assembly,
• feature,
• zone,
• virus,
• processor,
• organ,
• property,
• data,
• catalysis,
• population,
• organs,
• atom,
• nature,
• composition,
• object,
• product,
• layer,
• document,
• group,
• resource,
• deposit,
• service,
• stone,
• catalyst,
• network,
• corpus,
• core,
• sensor,
• construction,
• article,
• block,
• acid,