Modifiers matching allergen:

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

Simple categories matching respiratory:

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