Modifiers matching contamination:

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

Simple categories matching residual:

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