Modifiers matching allergen:

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

Simple categories matching respiratory:

• toxin,
• infection,
• disease,
• difficulty,
• cover,
• sound,
• equipment,
• condition,
• illness,
• disorder,
• control,
• problem,
• event,
• tube,
• signal,
• gas,
• connector,
• pathogen,
• carcinogen,
• complication,
• symptom,
• effort,
• protection,
• failure,
• virus,
• hazard,
• cell,
• sensitivity,
• treatment,
• reflex,
• interval,
• service,
• secretion,
• cancer,
• structure,
• component,
• pathology,
• death,
• tissue,
• organ,
• product,
• muscle,
• chain,
• allergen,
• depressant,
• passage,
• care,
• support,
• system,
• machine,
• drug,