Modifiers matching impurity:

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

Simple categories matching insoluble:

• substrate,
• electrode,
• material,
• sugar,
• substance,
• compound,
• surface,
• salicylate,
• oligosaccharide,
• drug,
• particle,
• mercury,
• component,
• product,
• shell,
• polysaccharide,
• waste,
• lipid,
• precipitate,
• powder,
• polymer,
• item,
• cement,
• metal,
• thing,
• system,
• medium,
• contaminant,
• fiber,
• sediment,
• pollutant,
• sulphide,
• fertiliser,
• matter,
• rock,
• fertilizer,
• filler,
• matrix,
• spinel,
• gas,
• fraction,
• liquid,
• soil,
• conductor,
• ester,
• solvent,
• metabolite,
• impurity,
• fibre,
• oxide,
• protein,
• halide,
• abrasive,
• aggregate,
• constituent,
• solid,
• coating,
• carbohydrate,
• salt,
• contamination,
• portion,
• chemical,
• form,
• alcohol,
• resin,
• phosphorus,
• particulate,
• builder,
• lubricant,
• mineral,
• deposit,
• hydroxide,
• nutrient,
• complex,
• molecule,
• monomer,
• object,
• phosphate,
• fluoride,
• residue,
• structure,
• solute,
• carrier,
• macromolecule,
• acceptor,
• bubble,
• scaffold,