Modifiers matching impurity:

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

Simple categories matching micro:

• molecule,
• organism,
• devices,
• part,
• beam,
• sensor,
• structure,
• pin,
• system,
• indication,
• credit,
• process,
• particle,
• motor,
• feature,
• variable,
• actuator,
• impurity,
• defect,
• material,
• herb,
• activity,
• drive,
• fauna,
• area,
• component,
• cavity,
• nutrient,
• invertebrate,
• mechanism,
• particulate,
• machine,
• ingredient,