Modifiers matching contaminant:

• harmful,
• inedible,
• fluid,
• airborne,
• corrosive,
• environmental,
• level,
• alkaline,
• urban,
• acidic,
• organic,
• inorganic,
• nonpolar,
• carbonaceous,
• indoor,
• outside,
• multiple,
• clean,
• harmless,
• common,
• harsh,
• greasy,
• natural,
• fibrous,
• damaging,
• light,
• solid,
• waterborne,
• hydrophobic,
• soft,
• finer,
• small,
• domestic,
• chemical,
• viscous,
• deadly,
• volatile,
• poisonous,
• unexpected,
• pure,
• combustible,
• mechanical,
• removable,
• animal,
• energetic,
• diverse,
• biologic,
• numerous,
• invisible,
• slippery,
• lightweight,
• separate,
• radiological,
• heavy,
• unseen,
• difficult,
• dissolved,
• charged,
• siliceous,
• abrasive,
• ordinary,
• ionic,
• dietary,
• conductive,
• noncombustible,
• caustic,
• anthropogenic,
• incidental,
• biological,
• non-metallic,
• key,
• undesirable,
• unhealthy,
• salt,
• tough,
• irritating,
• dangerous,
• smaller,
• intracellular,
• larger,
• possible,
• biodegradable,
• noninfectious,
• loose,
• soluble,
• large,
• magnetic,
• concrete,
• regulated,
• polar,
• moving,
• conventional,
• agricultural,
• meteorological,
• ic,
• external,
• unusual,
• exogenous,
• residual,
• insoluble,
• ambient,
• endogenous,
• up,
• nonmetallic,
• hazardous,
• accidental,
• typical,
• microbial,
• carcinogenic,
• hydrophilic,
• mobile,
• size,
• minute,
• important,
• lipophilic,
• oily,
• oleophilic,
• persistent,
• interfering,
• cationic,
• additional,
• dry,
• gross,
• structural,
• abundant,
• physical,
• sticky,
• active,
• liquid,
• gaseous,
• microscopic,
• synthetic,
• aqueous,
• single,
• nasty,
• coarse,
• noxious,
• semisolid,
• anionic,
• hard,
• mental,
• secondary,
• unique,
• experimental,
• toxic,
• unbound,
• basic,
• detrimental,
• potential,
• excessive,
• metallic,
• molecular,
• related,
• atmospheric,
• first,
• metal,
• stubborn,
• unacceptable,
• local,
• new,
• granular,
• out,
• fine,
• refractory,
• miscellaneous,
• elemental,
• dermal,
• world,
• heavier,
• minor,
• polymeric,
• unwanted,
• particulate,
• everyday,
• radioactive,
• surrounding,
• ferrous,
• ferromagnetic,
• opaque,
• passive,
• traditional,
• usual,
• individual,
• major,
• colloidal,
• reactive,
• stable,
• familiar,
• critical,
• floating,
• unsightly,
• conservative,
• suspended,
• unpleasant,
• visible,
• lighter,
• off,
• outdoor,
• foreign,
• model,
• extraneous,
• deleterious,
• undesired,
• industrial,
• dense,
• modern,
• over,
• several,

Simple categories matching ionic:

• contaminant,
• molecule,
• liquid,
• signal,
• compound,
• solid,
• mineral,
• group,
• system,
• substitution,
• drug,
• crystal,
• current,
• metal,
• component,
• waste,
• polymer,
• gas,
• equilibrium,
• oxalate,
• material,
• substance,
• constituent,
• metabolite,
• substrate,
• fluid,
• nitrate,
• azide,
• conductor,
• impurity,
• surfactant,
• solute,
• chemical,
• oxide,
• particle,
• ligand,
• insulator,
• tool,
• use,
• solution,
• fluoride,
• atom,
• salt,