Modifiers matching contamination:

• metallic,
• gross,
• hazardous,
• external,
• airborne,
• alkaline,
• high,
• particulate,
• environmental,
• industrial,
• loose,
• fragile,
• organic,
• hydrophilic,
• liquid,
• natural,
• deleterious,
• unwanted,
• active,
• fecal,
• microbial,
• biological,
• off,
• visible,
• solid,
• volatile,
• heavier,
• polar,
• internal,
• up,
• cross,
• chemical,
• possible,
• metal,
• foreign,
• insoluble,
• charged,
• inorganic,
• animal,
• molecular,
• common,
• fluid,
• penetrating,
• gaseous,
• heavy,
• nonpolar,
• atmospheric,
• colloidal,
• soft,
• residual,
• inert,
• irritating,
• toxic,
• regular,
• extraneous,
• light,
• minor,
• undesired,
• potential,
• incidental,
• regulated,
• salt,
• basic,
• harmful,
• physical,
• interfering,
• overhead,

Simple categories matching residual:

• material,
• component,
• liquid,
• stress,
• oil,
• gas,
• contaminant,
• nutrient,
• structure,
• sediment,
• carbon,
• constituent,
• waste,
• soil,
• halogen,
• toner,
• fuel,
• chemical,
• particle,
• product,
• solid,
• insecticide,
• organism,
• solvent,
• salt,
• reactant,
• herbicide,
• substance,
• resin,
• fiber,
• group,
• film,
• ion,
• flow,
• disease,
• contamination,
• monomer,
• deposit,
• pesticide,
• hydrocarbon,
• impurity,
• mineral,
• volatile,
• bin,
• compound,
• fumigant,
• metal,
• affinity,
• detritus,