Modifiers matching allergen:

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

Simple categories matching nasty:

• thing,
• stuff,
• pathogen,
• material,
• cause,
• parasite,
• emotion,
• disease,
• creature,
• infection,
• bacteria,
• contaminant,
• vice,
• chemical,
• content,
• condition,
• weapon,
• substance,
• program,
• germ,
• bug,
• pest,
• insect,
• animal,
• beast,
• predator,
• std,
• software,
• microbe,
• allergen,
• happening,
• item,
• weather,
• compound,
• sickness,
• disorder,
• illness,
• virus,
• critter,
• preservative,
• component,