Modifiers matching impurity:

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

Simple categories matching separate:

• particle,
• publication,
• discipline,
• organism,
• key,
• clothes,
• content,
• tool,
• unit,
• equipment,
• fuel,
• anchor,
• substance,
• focus,
• material,
• technology,
• theme,
• solid,
• pollutant,
• structure,
• category,
• apparatus,
• molecule,
• industry,
• activity,
• domain,
• topic,
• building,
• connector,
• machine,
• artifact,
• contaminant,
• box,
• location,
• macromolecule,
• institution,
• profession,
• garment,
• source,
• communication,
• clothing,
• feature,
• service,
• grouping,
• item,
• program,
• words,
• body,
• process,
• block,
• switch,
• region,
• object,
• complex,
• tradition,
• project,
• group,
• goal,
• instrument,
• document,
• compound,
• article,
• means,
• coolant,
• system,
• theory,
• entity,
• part,
• science,
• facility,
• cause,
• controller,
• field,
• disorder,
• mixture,
• metal,
• area,
• container,
• implement,
• product,
• formation,
• shelter,
• appliance,
• server,
• input,
• gas,
• section,
• sphere,
• application,
• language,
• organelle,
• rule,
• thing,
• impurity,
• subdivision,
• device,
• component,
• control,
• literature,
• conductor,
• subject,
• actuator,