Modifiers matching impurity:

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

Simple categories matching little:

• grain,
• germ,
• clothes,
• thing,
• creature,
• prize,
• hinderance,
• idea,
• organisation,
• fauna,
• treasure,
• animal,
• token,
• critter,
• extra,
• magazine,
• part,
• pastry,
• oil,
• fish,
• souvenir,
• instrument,
• clothing,
• organism,
• control,
• creation,
• item,
• pet,
• variable,
• bay,
• section,
• touch,
• cove,
• herb,
• toy,
• rodent,
• alarm,
• fruit,
• drink,
• material,
• plant,
• space,
• hardware,
• property,
• war,
• filler,
• nourishment,
• medium,
• weight,
• issue,
• shop,
• beast,
• tissue,
• icon,
• goody,
• binder,
• stuff,
• disease,
• artifact,
• training,
• feed,
• pest,
• kit,
• meal,
• support,
• jewelry,
• fluid,
• structure,
• waste,
• roughage,
• machine,
• sickness,
• decoration,
• imperfection,
• land,
• essential,
• motion,
• soap,
• product,
• carbohydrate,
• ways,
• area,
• figure,
• child,
• work,
• varmint,
• spice,
• business,
• defect,
• water,
• liquid,
• acid,
• object,
• snack,
• info,
• fact,
• kid,
• mineral,
• consideration,
• adhesive,
• species,
• detail,
• nutrient,
• light,
• equipment,
• program,
• story,
• payoff,
• photo,
• charm,
• details,
• substrate,
• taste,
• commodity,
• change,
• game,
• herbivore,
• bug,
• salt,
• article,
• feature,
• noise,
• gadget,
• bread,
• variety,
• flower,
• compartment,
• value,
• activity,
• content,
• bat,
• topper,
• mammal,
• insect,
• food,
• bacteria,
• information,
• appliance,
• particle,
• acetone,
• house,
• melody,
• stain,
• trinket,
• cover,
• action,
• book,
• impurity,
• character,
• preparation,
• container,
• despair,
• group,
• lint,
• evidence,
• widget,
• alcohol,
• car,
• behavior,
• piece,