Modifiers matching impurity:

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

Simple categories matching separate:

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