Modifiers matching allergen:

• nasty,
• home,
• common,
• rare,
• airborne,
• unique,
• environmental,
• single,
• large,
• indoor,
• special,
• outdoor,
• animal,
• particular,
• possible,
• potential,
• new,
• respiratory,
• harmful,
• outside,
• microscopic,
• individual,
• reactive,
• size,
• major,
• organic,
• unhealthy,
• identifiable,
• natural,
• dietary,
• typical,
• systemic,
• out,
• inhalant,
• seasonal,
• cutaneous,
• familiar,
• important,
• fine,
• allergic,
• american,
• perennial,
• harmless,
• relevant,
• additional,
• cereal,
• strong,
• active,

Simple categories matching harmless:

• foodstuff,
• substance,
• medication,
• chemical,
• animal,
• insect,
• residue,
• creature,
• souvenir,
• material,
• prey,
• thing,
• agent,
• antigen,
• carrier,
• particle,
• pollutant,
• allergen,
• bug,
• item,
• spider,
• plant,
• liquid,
• neighbor,
• rodent,
• component,
• preparation,
• matter,
• object,
• salt,
• bird,
• disorder,
• organism,
• gas,
• constituent,
• metal,
• solid,
• stuff,
• compound,
• preservative,
• food,
• activity,
• snake,
• ingredient,
• being,
• task,
• contaminant,
• sugar,
• drug,
• metabolite,
• powder,
• fluid,
• impurity,
• crime,
• critter,