Modifiers matching contamination:

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

Simple categories matching gross:

• change,
• material,
• measure,
• abnormality,
• matter,
• lesion,
• particulate,
• contaminant,
• property,
• day,
• solid,
• mutation,
• pollutant,
• error,
• recovery,
• contamination,
• form,
• disorder,
• event,
• feature,
• aberration,
• condition,
• pathology,
• alteration,
• anomaly,